Haliday was an actor and founding member of the Brattle Theatre Company (BTC) based at the Brattle Theatre in Cambridge, Massachusetts;[1] the BTC was an American version of England's The Old Vic.

Haliday ran the 55th Street Playhouse in New York and used it as a primary location for exhibiting Janus-distributed films, which included the films of Ingmar Bergman, Federico Fellini, Akira Kurosawa and Michelangelo Antonioni.

By the 1960s, Halliday was wealthy enough to look on acting as a hobby, and was able to satisfy his interest in horror films by traveling to England to appear in Lindsay Shonteff's Devil Doll (1964) and Curse of Simba (1964).

He would later return to England to appear in The Projected Man (1966), and Tower of Evil (1971).

By the mid–1970s, Haliday was semi-retired and living in France, where he spent the last few years of his life producing and appearing in French television and theatre roles.