(written from a Production point of view)
Stephen Kandel (born 30 April 1927; age 92) is a prolific television writer whose pen has produced episodes for many popular series, ranging from Sea Hunt in the 1950s through MacGyver in the 1980s, with stops in between at Star Trek, Mannix, Wonder Woman, The Six Million Dollar Man, Cannon, Barnaby Jones, Banacek and others. Any regular television watcher in the 1960s and 1970s has probably seen at least one Kandel story. (He is not the same man as A-Team creator Stephen J. Cannell.)
In addition to his produced scripts, he also drafted a story called "Warrior's World" in April, 1965 for Star Trek. It saw some preliminary pre-production work in the form of memos and meetings but it was not produced.