He went to Princeton University, primarily for the Triangle Club, the student organization that wrote and produced an original musical each year, and took it on a national tour. He wrote almost the full scores for his junior and senior year shows.

After two years in the Army – spent selling theatre tickets at a Times Square USO, he returned to CAPTAIN KANGAROO (where he started as a cue card boy), this time as a staff writer. He stayed as a staff writer, but during that time, he began his involvement with Julius Monk’s THAT WAS THE WEEK THAT WAS – a series of Plaza 9 revues. Clark also was involved in other cabaret, TV and other special material writing at that time.

All the while, Clark was working on a show, which evolved into YOU’RE A GOOD MAN, CHARLIE BROWN, which opened March 7, 1967 at the Little Theatre 80 St. Marks in the East Village. The huge success of that show led to worldwide companies, a Command Performance at the White House, and a recent Broadway revival.

Clark continued writing for SESAME STREET and THE ELECTRIC COMPANY. In 1990, he began a string of summers acting at the Weston Playhouse in Weston, Vermont. It was here that he began presenting his assorted songs in the little Act IV Cabaret revue, and THE JELLO IS ALWAYS RED was born. In 1998, that show was presented at the York Theatre Company.