Hydrogold has worked on golf courses designed by a long list of impressive Golf Course Architects.
A sample of over 30 of them (links to their web site provided where available)...

Andy Dye (6)

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

Bernhard Langer (2)

Bob Hunt (1)

Bob Shearer (1)

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

Colin Montgomerie (3)

E&G Parslow (6) (Links to their web site)

Ernie Els (1)(Links to their web site)

Fred Couples (1)

Gary Player (6) (Links to their web site)

Golfplan - Fream, Dale & Ramsey (6) (Links to their web site)

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

Greg Norman (2) (Links to their web site)

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

International Management Group (IMG) (27) (Links to their web site)

Isao Aoki (1)

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

Jesper Parnevik (1)

JMP Golf Design (24) (Links to their web site)

Karrie Webb (1)

Max Wexler (1)

Michael Coate (1)

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

Nick Faldo (5) (Links to their web site)

Peter Dalkeith Scott (2)

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

Rodney Wright (4) (Links to their web site)

Roger Davis (1)

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

Vijay Singh (2)