Gwynne joined the
Brattle Theatre Repertory Company after his 1951 graduation, then moved to New York City. To support himself, Gwynne worked as a copywriter for the
J. Walter Thompson advertising agency, resigning in 1952 upon being cast in his first
Broadway role, a gangster in a comedy called
Mrs. McThing starring
Helen Hayes. Gwynne preferred theater to film and television, and maintained that if the United States had a national theater mounting year-round productions, he would rather work there. From 1975 to 1982, Gwynne appeared in 83 episodes in different roles on the popular radio drama series, the
CBS Radio Mystery Theater, produced and directed by
Himan Brown. He returned to Broadway in 1976 as Colonel J.C. Kinkaid in two parts of
A Texas Trilogy. In 1984, Gwynne auditioned for the part of Henry on the sitcom
Punky Brewster, then withdrew in frustration when a director identified him as Herman Munster rather than by his real name. Gwynne's performance as Jud Crandall in
Pet Sematary was based on author
Stephen King, who is only an inch shorter than the actor, and uses a similarly thick Maine dialect. The character's likeness and accent, as played by Gwynne, have been used in a number of episodes of the animated show
South Park, beginning in 2001 and as recently as 2019. Gwynne also had roles in the movies
Simon,
On the Waterfront,
So Fine,
Disorganized Crime,
The Cotton Club,
Captains Courageous,
The Secret of My Success,
Water,
Ironweed,
Fatal Attraction, and
The Boy Who Could Fly. Despite his misgiving about having been typecast, he agreed to reprise the role of Herman Munster for the 1981 TV reunion movie ''
The Munsters' Revenge. Gwynne performed the role of Judge Chamberlain Haller in his final film, the 1992 comedy My Cousin Vinny''.
As painter and illustrator In addition to his acting career, Gwynne sang professionally, painted, and wrote and illustrated children's books, including
Best in Show (later titled ''It's Easy to See Why
), A Chocolate Moose for Dinner
, The King Who Rained
, Pondlarker
, The Battle of the Frogs and Mice
, and A Little Pigeon Toad''. Many of these efforts were based on children's frequent misperceptions of things they hear from adults, such as the "chocolate moose for dinner", illustrated as a moose seated at the dinner table. The other books on this theme were
The King Who Rained,
A Little Pigeon Toad (in which a child's mother thus describes her father), and
The Sixteen Hand Horse. Initially the books did not achieve wider popularity because their format was geared to a very young audience, but the concept was more appealing to older children and adults. Eventually they achieved critical success and became regular bestsellers for their publisher. He also did his voice work for TV and radio commercials. Later in his career he held several shows of his artwork, the first in 1989. ==Personal life==