Gertsman's first film of note was Jungle Captive; he shot the final two Sherlock Holmes movies starring Basil Rathbone and Nigel Bruce, Terror by Night and Dressed to Kill, and the final Rondo Hatton vehicle, The Brute Man. At American International Pictures he photographed the horror satire How to Make a Monster, while at United Artists he lensed Invisible Invaders and The Four Skulls of Jonathan Drake. In 1959, he became the cinematographer on the television series Adventures in Paradise. His film work became far less frequent after 1960. Like many of his contemporaries, Gertsman finished his career working in television, on shows like Arthur Lubin's Mister Ed series (1961-66) for Filmways Television and most specifically for superstar Lucille Ball and her two subsequent sitcoms The Lucy Show (1962-68) and Here's Lucy (1968-74), the latter of which was produced under her own Lucille Ball Productions, Inc. banner.