McCouch grew up in Chappaqua, NY and received a Bachelor of Arts Honors Degree in theater from Hamilton College in Clinton, NY where he also played varsity lacrosse and rugby. McCouch went on to receive a graduate degree from the British American Drama Academy, Oxford-Yale program in London.

McCouch spent four seasons with the Williamstown Theater Festival, MA (1988-1992), where he performed in Arturo Ul, The Visit, Three Penny Opera, A Midsummer Night's Dream, Inherit the Wind and The Moonstone. In 1992, he performed in Electra with the Almeida Theater in London. He also appeared in The Royal Court's Women Beware Women. His next project was three years on Another World where he played Dr. Morgan Winthrop. Next came the blockbuster hit Armageddon, where McCouch played Munition Specialist Gruber.

Recent performing credits include seven years on As the World Turns where McCouch received an Emmy Nomination for Best Supporting Actor. His portrayal of Dusty Donovan was a fan favorite. Other great performances; The Apostles/Fox, Dope/FX, Momentum/Miramax, Throttle/Dimension, Legacy/Alliance Atlantis, UPN, All Souls/Sci Fi, UPN, The Agency/CBS, Airtight/Sony, Viacom, Beverly Hills 90210/Spelling, Forbidden Island/Spelling, Cosby Mysteries/NBC.

Grayson McCouch now plays Don, Adriana's single father and a surgeon, on the Nick at Nite new drama series, Hollywood Heights.