Morrish served a four-year apprenticeship with Robert Trent Jones, and subsequently two years with George Fazio.
From 1972–1982, he worked for Jack Nicklaus as a member of his golf course design support staff.
[2] In 1983, Morrish left the Nicklaus organization and formed a partnership with PGA Tour professional Tom Weiskopf.
[3] Morrish was a member of the American Society of Golf Course Architects, and was president of that body from 2002–2004.
In 2007, Morrish was inducted into the Colorado Golf Hall of Fame in a ceremony at Columbine Country Club.