American television writer who wrote The Deadly Years and co-wrote A Piece of the Action for the original Star Trek, then returned for the animated episode The Eye of the Beholder.
David P. Harmon was a prolific television writer whose credits ranged from westerns to comedies such as Gilligan's Island and The Brady Bunch.
He wrote two second-season episodes of the original Star Trek. In The Deadly Years, radiation on Gamma Hydra IV makes Kirk, Spock, McCoy and Scott age decades in days, and Kirk is relieved of command just as the ship strays into the Romulan Neutral Zone. A Piece of the Action, on which he shares the teleplay with Gene L. Coon, visits Sigma Iotia II, whose people have modelled their whole society on a book about Chicago gangsters.
Harmon returned for the animated series with The Eye of the Beholder, in which the Lactrans keep Kirk's landing party as zoo exhibits.