Hydrogold has worked on golf courses designed by a long list of impressive Golf Course Architects.
A sample of 33 of them (links to their web site provided where available)...

Andy Dye (6) (Links to their web site)

Ault, Clark & Associates (1) (Links to their web site)

Bernhard Langer (2) (Links to their web site)

Bob Harrison (1) (Links to their web site)

Bob Hunt (1) (Links to their web site)

Bob Shearer (1) (Links to their web site)

Chris Pitman (2) (Links to their web site)

Colin Montgomerie (5) (Links to their web site)

David Hemstock (1) (Links to their web site)

E&G Parslow (9) (Links to their web site)

Ernie Els (3) (Links to their web site)

Fred Couples (1) (Links to their web site)

Gary Player (7) (Links to their web site)

Golfplan - Fream, Dale & Ramsey (7) (Links to their web site)

Graham Marsh (3) (Links to their web site)

Greg Norman (3) (Links to their web site)

Ian Woosnam (4) (Links to their web site)

International Management Group (IMG) (26) (Links to their web site)

Isao Aoki (1) (Links to their web site)

Jack Nicklaus (3) (Links to their web site)

Jesper Parnevik (1)

JMP Golf Design (35) (Links to their web site)

Karrie Webb (1) (Links to their web site)

Max Wexler (4)

Michael Coate (1)

Nelson & Haworth (13) (Links to their web site)

Nick Faldo (6) (Links to their web site)

Peter Dalkeith Scott (2) (Links to their web site)

Phil Jacobs (2) (Links to their web site)

Retief Goosen (1) (Links to their web site)

Richard Chamberlain (1) (Links to their web site)

Rodney Wright (5) (Links to their web site)

Roger Davis (1)

Ross Watson (8) (Links to their web site)

Vijay Singh (3) (Links to their web site)