(written from a Production point of view)
Max Simon Ehrlich (10 October 1909 – 11 February 1983; age 73) was a mainstream and science fiction writer best known for his novels The Big Eye (1949) and The Reincarnation of Peter Proud (1974). He adapted the latter into a feature film, which featured a score by Jerry Goldsmith. For Star Trek: The Original Series, he wrote the story and teleplay for the second season episode "The Apple". His work for television include such series as The Untouchables, Arrest and Trial (starring Roger Perry), The Defenders, Voyage to the Bottom of the Sea, Tales of Tomorrow, and The Wild Wild West.
Ehrlich was already an experienced writer by the time he came to Star Trek. He had won an award from the Writers' War Board for his work during World War II, and also worked for the script division of the American Jewish Committee prior to the war, an advocacy group which campaigned against anti-Jewish bigotry at home and abroad.