Our products & service

“Just a quick note to say that the package of materials arrived. Great stuff! Thank you for the quick turn around and the surprise gifts – very much appreciated.”

Pete L.

Stonefly nymph

A really nice rainbow I caught on the Frosty Fly Game Golden Stone Fly.

Bob Anderson

FFI Certified Casting Instructor

Horse fly

Had a last minute chance to hit some water again tonight. The fish we’re super picky but the frosty fly flies came they like a champ.

Robert Clark

Hemingway’s Realistic Flies

“Guys (and Ladies), if you have not tried Hemingways you need to do so. Beautiful, quick, and easy……..did I say beautiful?”

Bill Ryan

Stonefly Nymph

“…They produce a range of printed nymph backs and wing buds along with matching silicone rubber legs for tying semi-realistic stonefly nymphs. The backs and buds are pre cut from waterproof, UV resistant material with a self-adhesive backing, and come printed with realistic stonefly nymph colouration. The matching legs are molded from silicone rubber, soft…

Peter Watson

Fly Life Magazine

Frosty Fly

“…Nice doing business with a company that cares! “

Rocky D.

Great product with a wide selection of products for the fly tier and flyfisher. The customer service is great and will take care of your needs.

Ken Held

Hemingway’s Tube Body Mayfly

“Started using these bodies last year for Green Drake and Hexagenia patterns easy to work with and very realistic I use a marker to color them to suit look I want and sometimes use a Partridge K10 Yorkshire Fly Hook (extended body) the body is hollow so it just slides over the extension, which helps…

Paul H.

They catch fish!

“I think this is my third order from you and I don’t expect anything other than quality from you guys, it’s truly exceptional and they catch fish , I will continue to purchase from FrostyFly and have told friends, etc. about you. Kind regards Dougie”

Dougie

Hemingway’s Realistic Flies

“Actually pretty easy to tie!”

Mity Joe

All Round Dubbing

“…tied a couple of green caddis flies with the middle olive all round dubbing. It took a little getting used to tying small flies since all I’ve been tying recently is big saltwater flies but your dubbing is really nice to work with and the color looks really natural, I can’t wait for the season to start so…

Ted Cassar

Hemingway’s Stonefly Nymph Buds & Back

“Got some stonefly backs and buds and started working with them. This is my MK. 1 Skwala nymph still working on improving it. Frosty fly products have not let me down yet great stuff looking forward to using some of their other products and add photos here.”

Ken Held

Frosty Fly Pro Staff

Hemingway’s stonefly wings

I just got finished tying with the new stonefly wings I ordered awhile back and my golden stones look like the real. Thanks for making a great product, this is one of the flies I will be tying at the Salt Lake Expo. Ken Held

FrostyFly

“…I received the package. Woooow. The shipping is very fast. Thank’s. The flies are beautiful. I am very happy with your products. It is of very good quality…”

Gerard Germain

Gerryfish Sport

Frosty Dubbing

“Frosty Dubbing all one type of fibre; curious stuff. Frosty looks translucent until you turn it and it seems to gleam. I guess this has a flashier side or angle to the fibre, but whatever it is that does it the effect is pleasing and prevents this becoming brash or harsh. From the pack the fibres…

Magnus Angus

Fly Fishing & Fly Tying Magazine

Awesome material!

“Just received my first order, awesome material. I’m putting in a second order as I write, trying to checkout. Again thank you!!!!!”

Howard R.

Great flies!

“Thank you for the great flies that I have purchased from you. You have a super products. When my fishing buddies see these flies, there will be many more orders coming your way.
I am also a fly tier and have not been able to tie flies at this time because of recent eye…

Michael

Fly tying materials

Just want to say MERRY CHRISTMAS to all of you at frosty fly.com. I have had a great time putting together your products. Those I show them to are amazed at the life like appearance. Once again SEASON GREETINGS to all of you and like spock said on star trek. LIVE LONG & PROSPER ……MAXWELL

Maxwell Sharpe

Hemingway’s Wings & Tube Bodies

“For any of you out there that have NOT tried the Hemingway’s from Frosty Fly, you are really missing out. The wings they offer are second to none and as soon as I get back home I will be ordering Mayfly wings and bodies. Try some and fall in love with making realistic winged bodies…

Bill Ryan

Hoppers

I tied on one of those grasshoppers and cast it into a pool or eddy water…swirled for a few seconds before a big hen chrome crushed it taking me downstream…….was awesome…. Kenneth Dawson

Our products

“I wanted to tell you that I had received my order. And I’m very satisfied.
Materials are very realistic. I am going to be able to create beautiful flies. Thanks to your products and for your seriousness.
Thank you again.”

Philippe

Mayfly & Caddis Wings

“Those mayfly and caddis wings are awesome!”

Rob Cesta

FLY GUIDE

Our products & customer service

“I just wanted to say I love your products! Your shipping is faster coming from Canada than if it would ship to me from the USA and I live here!!! Thanks for the great products and customer service!!!”

Ryan R.

Fly Tying Materials

“Love all the goodies for building some amazingly realistic fish bugs and really enjoy all of the informative and dare I say, inspirational, tying videos on the website!”

Aaron Deaver

new client

Hi to all!
Sorry for my spelling, but FLY FISHING IS INTERNATIONAL, I’m French.
My father was a great artist, but with the new materials that I got from FROSTYFLY, I will never be as good as he was but I will be close. Thanks for the great products and great service on…

Gilles Paulin

Realistic Wings

“I love the Hemingway wings!”

Larry Bendall

Awesome store!

Awesome Store to buy Material and Fly. Their products are amazing and really easy to use.
I am starting on Fly tying and my friends are impressed with the quality of the fly a have done! The tutorial section on the site is very helpful and well done
The customer service is impeccable…

Patrick Hudon

Quality products excellent service.

Jim Misiura

You guys are really top of the line!

“I really appreciate your professionalism in you guys\’ products. I’ve never gotten a hand written note saying thank you for your order on any my receipts from any other company. You guys are really top of the line and I can\’t wait to use my materials. Thank you guys I will definitely be bragging about…

Josh B.

Stonefly Nymph

Caught this bruiser on a little grey nymph that I picked up from you guys. Pretty much everything I have gotten from you has worked great!

‎Cameron L Bryant‎

Frosty Products

I just wanted to say a very heartfelt thank you. Your company was fast in shipping of products and they are fantastic products. They are easy to work with and make a beautiful end result. I have recommended you to all of my friends and family who tie flies. THANK YOU so very much

Cody Lax

Realistic flies

These things work like a hot damn! I bought some adult mayfly and stonefly patterns of various colours and sizes, Frosty Fly gave me a grasshopper sampler on top of my order to top it off. All of those flies have proven their worth. You know when you get fish that moves on your fly…

hustle_trout

Fly Tying Materials

I have fallen in love with these products!! Easy to work with. They make fantastic flies, can not wait to fish them.

‎Cody Lax‎

Frosty Fly

“…I just wanted to say thank you, and that it has been a pleasure working with. Very prompt and very personable…”

Mike Lucas

Damn, you have some good stuff!

“Damn, you have some good stuff! Ordering soon, love your website………….Thanks”

Jared K.

Furled Leader – Grayling

“Hemingway’s Grayling leader uses fine monofilament nylon as the raw material. As with ‘laid’ ropes, once the furl is twisted together the ends need to be finished in some way to prevent them fraying. Hemingway’s has opted to loop both ends which does the job well and suits most fly fishers – it lets me…

Magnus Angus

Fly Fishing & Fly Tying Magazine

Hemingway’s Thread

I’m impressed with this thread! Didn’t even know Hemingway’s made thread!

Eric Blackshear

Love the patterns and how realistic the flies are! I will always stand by this brand because of how well these flies produce fish when nothing else will.

Sylvan Rathfon

Our Flies

“Thank you Frosty Flies! I would just like to thank your company for selling such great flies!! I’ve been fly fishing for twenty five years. This is the honest truth. I got up early eager to fish with my new batch of flies and decided to use a sanjuan worm with your pupa as a dropper..…

John C.

Realistic Hopper Bodies

“After 10 years of commercial fly tying, I have finally found a product line that supports innovation. These are the most realistic Hopper materials I have had the pleasure of tying with. I can’t wait for hopper season to come so I can watch trout swallow these off the surface. Do yourself a favor and…

Clay Erickson

Frosty Fly Pro Staff

Hemingway’s Realistic Mayfly Wings

“I would like to say great product, I have your mayfly wings and they are awesome and the fish love them…”

Dave P.

FrostyFly Products

“Will assuredly be returning to shop with you folks. Fine stuff you carry indeed!”

Bob Cecil

Hoppers

“I had 5 different hopper patterns in the fly box and your green one was the only kind the fish were interested in at all!!”

@backcountryflies

Maruto Dry Fly Hooks – Barbless, Fine Wire, Black Nickel – d04

“I have used countless brands of barbless competition hooks over the last year and must say that the Maruto brand barbless dry fly hooks are on par with some of the big names in the industry at a fraction of the price. Also with most other brands of competition style hooks I expect to find…

Corey Cabral

Frosty Fly Pro Staff

I am new to fly

I am new to fly tying, but have found the quality of the products and the service to be excellent. Will be ordering again.

Geoff

Hemingway’s Products

“..yesss sa c un de mes meilleur..”

Emmanuel Berger

Dubbing – Hare Plus UV

“Great Dubbing. With some mixes I find the ratio of guard hairs to underfur very inconsistent. With the Hares Ear Plus ever mix I have used has been very consistent and ties some very buggy and good looking flies. The UV is subtle but adds a nice attractant quality to flies tied with it.”

Corey Cabral

Frosty Fly Pro Staff

Flies

“Hi there, I have just received my order in UK. Really pleased with quality of flies… can’t wait to try them out. Many thanks for sticker. Kind regards,
Gary G.”

Gary G.

Realistic Wasps

“I just received two of your #12 size Realistic Wasp flies, and they are terrific! I plan to purchase several more….Thanks for your wonderful products”

Jeffrey Kidder

Tenkara Rod Petz

“Amazing rod at an affordable price! I have tried out a few different tenkara rods and owned one from a generic manufacturer before getting my hands on the Hemingways Petz rod. This rod puts them all to shame. The petz rod has a beautiful feel in hand, casts as smooth as butter yet has enough…

Corey Cabral

Frosty Fly Pro Staff

Thank you at frosty fly for helping me create this stonefly nymph. Sincerely….Don Rose

Don Rose

Hemingway’s CDC Feathers

“These feathers were exceptional compared to CDC feathers I’ve used in past. I hope this product remains available as long as I tie flies. Would like to see the tan or dun colors in stock.”

Joseph W.

Realistic Bumblebee

I use bees and wasps in the summer in the high country of the Big Horn Mountains and I am never disappointed and rarely out fished. The brookies and browns can’t resist a juicy bee.

Kevin Lewis

Bighorn Mountains

Tube Bodies

“…Tube Body’s are made from long dubbing fibre wound around a mandrel (often a needle of some sort) cemented and removed from the former. These tubes are tough so they can withstand casting, how they stand up to a few fish chewing on them is down to the fish and a little luck. On a…

Magnus Angus

Fly FIshing & Fly Tying Magazine

Stonefly Nymph

“I like your products. I went last Sunday to fish and I caught two salmon with stonefly…I was very happy… one of my friends fisherman also caught two salmon with stonefly bought of me … then it is a proof that the Hemingway products are very good, they are magic …”

Gerard Germain

Gerryfish Sport

Stonefly Nymph

Finally got a chance to use some of your flies, they FREGGIN ROCK!!!

Ruth

@navajoflyfisher

Hemingway’s Realistic Nymphs

“..The realistic nymphs are so lifelike that they say it looks like it could walk away…”

Joseph Whalen

Our service

“Thanks for the speedy customer service. Received the replacement a couple a days ago. Looking forward for a chance to try out this great looking fly.”

Brooke B.

Thank you very much for a very speedy delivery. The products are fantastic, I am very pleased. I look forward to ordering from you guys in the near future!! Cheers and tight lines 😎

Aaron H.

Realistic hopper

Another brute! Thanks for producing some awesome materials!

Jesse Luke

Jess.luke

Realistic hoppers

Just wanted to tell you folks that these hoppers are tearing up the west slope cutthroat of western Montana. They are an easy tie and look so real on the water it is hard for the trout to resist. Pics are of my rendition of your hopper and my rendition of your salmonfly. The salmonfly…

Larry Hanson

Missoula, Montana

Stonefly bodies

Another @frostyflyfishing stonefly body doing the job. I’m taking 85% of my mountain cutties on this fly with exceptional durability.

Steve Price @sprice7m

Skullguy.ca

Our Service

“Thank you for expediting my order; I received it yesterday! Great Service!…Thanks again for your quick service!”

Bob A.

Hemingway’s Realistic Stonefly Nymph Legs

“…I use the L size on my golden stone adult foam bodies and they are killer!”

Larry H.

Hoppers!

Last year I wrote you folks regarding how well your hoppers were working on the west slope cutts of Montana. They were also well received recently by brown trout on the front range. Awesome product! They look incredibly lifelike on the water and are a quick and easy tie.

Larry Hanson

Our Products

“The Hemingway products are the best!”
“…Thanks for responding. Love your products!”

Steven Willis

Our Products

“I use your material since a year ago and I try it last summer. They was a good stuff and solid..”
“…I like the Hemingway product then other I was trying.”

Clifford C.

Our Product Selection

“Thank You !! You offer products like no other fly tying material supplier. I will order more products again in the near future.”

John S.

CDC Feathers

“…Feathers from both packs seem to be in first class condition. Plume sizes vary from tiny and hardly useful to large (for CdC), larger than typical mallard CdC. The really tiny feathers mean there will be some waste from a pack, but not a lot. The vast majority of the feathers are of fly tying…

Magnus Angus

Fly Fishing & Fly Tying Magazine

Realistic Flies – STONEFLY NYMPH – Set of 6 Flies – 2 Colors, 3 Hook Sizes

“Wow to the realism of these stoneflies! Can’t wait to try these nymphs on two specific rivers that thrive in stoneflies in particular… the Piedra River in Colorado (brown stoneflies), and Rock Creek in Montana (yellow stoneflies). Should be a rodeo.”

Wichita from Durango, CO

Realistic Golden Stones

Your realistic golden stones let me beat my PB brown trout twice in a row! Absolutely love them!

Liam Wichert

@bowriverrodbenders

Realistic Wasp & Bees

“I received my order of wasps and bees today and am extremely satisfied with the quality and cost per unit. I am finding it difficult to find good foam terrestrials and I am pleased I stumbled across Frosty Fly using a Google search. I usually fish the Bighorn mountains in Wyoming and have discovered that…

Kevin L.

Our Products

“Thanks for great fly tying materials. I love tying fishable realistic patterns!”
Dan’s Realistic Mayfly Nymph

Dan Herrick

Renomed FS3

Oh, I got my Renomed scissors last week from you guys and I have to say, they are incredible. Beautiful, super light and insanely sharp. It’s a crazy difference to trim a little deer hair just to see…..the Renomed just sliced right through it, so smoothly. The only thing I’d change is larger finger loops…

Eric B.

Realistic Flies

“I tested these flies out throughout the summer months. When I first looked at them, I was impressed by their realistic appearance, but was skeptical about the floatability of the dry flies. The minute I put the flies on the water, the concern vanished. They float. I fish a few streams that get pounded hard…

Derek Bird

Fly Fusion Magazine

Tenkara Landing Net Small

“I love your Small Tenkara Landing Net! Not only made with very good craftsmanship, but the curved Tenkara handle design allows for nestling in the hand and then allow then for a special, secure “flick” of the wrist to dip up trout (best is tail first; then the mouth is available better for fly removal).…

Dennis Franke

Dennis Franke Flyrods – Liteline Graphite Flyrod Designs

Tube Fly System – Outer Tube

“I grabbed a few packages of the Tube Fly System – Outer Tube at the local fly shop and have been playing around with them for tube flies over the last few days. Easy to cut, durable, nice melt when finishing the fly and great colors. Matched with the junction tubing creates some nice tube…

Corey Cabral

Frosty Fly Pro Staff

Just mounted…

“Just arrived, just mounted…;) Thanks,
Arnaud”

Arnaud P.

Beaver Dubbing Plus

“Beaver Dubbing Plus blends beaver with a “touch of superfine sparkling Antron”. Again, the main constituent in the mix is a natural under-fur. Beaver, like muskrat, has a very fine dense under-fur which does a fine job on dries. Personally, I think it’s the fine texture of the hair, which suits beaver to dries and…

Magnus Angus

Fly Fishing & Fly Tying Magazine

Realistic Firefly

Lightning Bug/Firefly pattern is superb summer fly! The wild trout in the GSMNP think so.. can’t beat the realism of Frosty Fly.

Neal Drakage

Custom Tackle Review

Awesome materials!

“Your shop is full of awesome materials for fly tying and fly fishing!”

Shelby R.

Mayfly Tube Bodies

“I purchased a few packages of these tube bodies in different sizes and colors and have recently been playing with them. They make tying realistic looking extended dry fly bodies a breeze. Nice selection of colors and sizes, and easy to use.”

Corey Cabral

Frosty Fly Pro Staff

Magnetic Net Release

“The prosaic name gives this away, without that I have a couple of cord loops and a small wooden oval – pull on the loops and you find powerful wee magnets holding the halves firmly together. Loop one end to a net, the other to a ring on a jacket, bag, pack, waders or waistcoat.…

Magnus Angus

Fly Fishing & Fly Tying Magazine

Super fast shipping to the USA…..amazing Flys, absolutely realistic.

Matthew S. Hollar

Pleased with the quality of flies!

“Hi, I received my order and wanted to let you know how pleased I was with the quality of the flies. I intend to order more in the future! Thanks!”

Andre A.

Realistic Cicada Fly

“I ordered one in gold, and it is of excellent quality. I am excited to test it out! I probably will go back and buy the set!”

Ellen

FrostyFly Products

“Hello FrostyFly, First, I would like to tell you that you have great products. There amazing. I have purchased them in the past and have just made another order a few minutes ago. I am going to pass your company name and info onto a local sports shop which is where I buy most of…

Ross Hall

Musquash, NB

Realistic Extended Mayfly Body

My Wally Wing Brown drake dun using your realistic mayfly body. New ammo for the Silver Creek hatch next week!

Brad Chinn

Sun Valley, Idaho

Hemingway’s Trout Landing Net

“Generally speaking, fly anglers want functional products that are also aesthetically pleasing. The Trout Landing Net by Hemingway’s hits the bill for both. The net is made of soft nylon so the creation takes into consideration the conservation of the fish. More than that, the finish applied to the handle indicates a pride of workmanship and…

Derek Bird

Fly Fusion Magazine

Great store if you want to buy flies

Great store if you want to buy flies. They also have materials to make realistic looking flies with ease. Their service is quick and reliable. This is my new go to fly tying internet store.

Patrick D'Antonio

Skagit River Solid Walnut Wooden Streamer Fly Box

“Awesome little fly box, well crafted.”

Ross

Frosty Fly

“Great store if you want to buy flies. They also have materials to make realistic looking flies with ease. Their service is quick and reliable. This is my new go to fly tying internet store.”

Patrick D'Antonio

Caddis wings

I’ve just tied my first mayfly and I’m really impressed. I’ve now tied two more mayflies and some caddis using the Hemingway caddis wings. The Hemingway products really are excellent. Colin

Colin

Hemingway hook H118

Used these. Wider gap = Hooks that Hookum!

Gordon Outhier

Hemingway’s CDC Feathers

“Just wanted to send you this picture of a nice rainbow I caught with an October caddis pattern I tied with your Hemingway CDC feathers for wings. Thanks for excellent fly tying materials.”

Joseph Whalen

Frosty Fly

“Thanks a bunch! Love what you guy’s are doing with the industry! By far, the coolest thing I’ve seen in a long time!”

Josh L.

Our flies

“Frosty, got the order. Flies look great!!!!!!!!!!!”

Shawn F.

Unbelievable realism

Unbelievable realism to trout!!! I’ve had huge trout fully commit on a Frosty Fly Hopper!! Great products!

Neal Drakage

Maruto Carp Fly Hooks – Barbed, Reversed, Black Nickel – 8832-SSC+CP

“Very interesting hook. Very solid and strong and offset to the side which in my experience results in better hook ups. I can see this hooking working excellently as a trailer on an intruder of steelhead stinger style pattern.”

Corey Cabral

Frosty Fly Pro Staff

Mayflies

“Hi. I’ve received my realistic mayflies selection of 10 and the other flies, very pleased with them, will be ordering a lot more. Regards,
Mark W.”

Mark W.

Our Products

“Your products are amazing. Thanks!”

Kevin I.

Materials

“I enjoy tying with your fly materials. I believe they have definitely helped clients catch some trophy size fish on pressured waters. Thanks for making some of the most innovative and realistic materials on the market.”

Brian Stewart

Fly Fishing Guide

Your products

I made hydropsyche larvas with your bodies with hooks. The result is great, to tie them is almost too easy.
I also made several stone fly nymphs. They look spectacular. You have to be very precise to make them.
I used your wings on big dry mayfly. It looks very good.
I…

Thijs Rutten

Tenkara Gear

“This represents a pair of Hemingway’s outfits, more or less complete with rod, line, flies, net and sling/pack – all the essentials to get started with tenkara fishing. Faced with the pieces I found it very easy to join them into a useable fishing outfit. The rod is telescopic with a knotted nylon cord at…

Magnus Angus

Fly Fishing & Fly Tying Magazine

Stonefly Nymph

The flies crushed Montana.
Pulled some big fish out with those stones. All my buddies took all my flies cause they did so much better than the flies at the shop.

Rhino Nets

Wing buds and backs/Stone fly Nymph Rubber legs.

Guys and Gals out there, I highly recommend these products. It made tying a very realistic pattern easy. I like the fact that the Buds and Backs have a little tabs and adhesive to help with tying in. Also the 3D effect it gives with a little UV resin on top, really makes them pop.…

Shane Schuster

Dirty Rig Fly Co

Can’t wait to get them onto the hooks!

“Hi, I just got my order and a big thanks, can’t wait to get them onto the hooks! Thanks, Ivan”

Ivan

Hemingway’s Caddis Wings

“Have been tying caddis patterns over the winter to stock up as I go through a lot of them. These wings are great, unlike the mayfly wings they peel off easily, no cutting required and are easy to tie on, giving a very realistic pattern. I used to use turkey wing segments sprayed with a…

Paul H.

UV Hare Dubbing Plus

“Three quite different dubbings here – two blend, one pure synthetic – and all three seem like well prepared dubbings. UV Hare Dubbing Plus blends hare with “fine sparking Antron and UV ice dubbing”. Actually, the pack says, “hare’s ear guard hairs” but this has a high proportion of under-fur in the mix and is certainly…

Magnus Angus

Fly Fishing & Fly Tying Magazine

Our Products

“…My first order arrived and was great, tied 40 caddis flies in about 3 hours.”
“…Thanks again for the great products.”

David M.

Hemingway’s Realistic Wings

“Wings? You want wings? We have wings! There are three types here: May Fly, Caddis and Stone Fly. All are made in the same way – a pre-cut shape on a backing sheet, all printed with details that suggest the natural wing. May Fly and Caddis come as pairs, Stone Fly as two separate wings.…

Magnus Angus

Fly Fishing & Fly Tying Magazine

Hemingway’s Realistic Mayfly Wings

“I bought these and have used them on several flies. I found them to be easy to work with. My suggestion would be to taper the tabs to a point versus a square point. Sometimes it’s more difficult to wrap the tabs. Once you get them tied in, they are awesome. They make your flies…

Patrick D.

Realistic Stonefly Nymph Wing Buds & Back

“Before using this product I absolutely hated tying stone flies. Fiddling around with turkey tail wing cases drove me nuts and made me dread sitting down to fill my boxes. With the Hemingway’s Realistic stonefly buds and backs I no longer have any problem sitting down to tie a dozen nymphs to stock my boxes…

Corey Cabral

Frosty Fly Pro Staff

Excellent realistic materials!

“I love your Company! I have your sticker on the truck! The truck goes all over California! I definitely will order up the shells and eyes! Amazing products! I love all your excellent realistic materials! I will take some photos of some of the flies I have tied with your material! Can’t wait for the…

Daniel B.

Beetle LEGS

Trout absolutely shredded this beetle. Didn’t think the legs would make that much of a difference but they did!

Al Bud

Amazingly realistic fish bugs

Love all the goodies for building some amazingly realistic fish bugs and really enjoy all of the informative and dare I say, inspirational, tying videos on the website!

Aaron Deaver

Frosty Fly products & service

“Thank you for excellent products and service. I have been a customer now for less than a year but am glad I found your website. I have been a fly fisherman for many years and the flies I tie with Hemingway’s products have impressed many seasoned buddies. I really appreciate the dubbing you sent for…

Joseph Whalen

Great fly’s. The quality of the fly and the material hold up amazing against hard strikes. Great job!

Robert Clark