Michael Gregory is an American actor with a long-running career in film and television who also became a prolific voice actor in anime and video games, particularly during the late 1990s and 2000s. Born on November 26, 1944, in Brooklyn, New York, his career as a character actor began in the early 1970s with guest roles on numerous television series such as All in the Family, Kojak, and Gunsmoke, as well as a recurring role as Dr. Rick Webber on the soap opera General Hospital from 1976 to 1978. He also appeared in prominent feature films of the era, including Beverly Hills Cop, RoboCop, and Total Recall.

With the rise in popularity of Japanese anime being localized for Western audiences, Gregory found a new avenue for his work as a voice actor. He lent his distinct, authoritative voice to a wide range of characters in several iconic series. Among his most recognized anime roles are Laughing Bull in Cowboy Bebop, Brilliant Dynamites Neon in Trigun, and multiple characters across the Ghost in the Shell franchise, including Tsujisaki in Ghost in the Shell: Stand Alone Complex and Chief Nakamura in Ghost in the Shell: Stand Alone Complex - Solid State Society. He also voiced the character Totem in the cult classic Serial Experiments Lain.

In direct relation to the provided examples, Michael Gregory voiced the antagonist Professor Gill, also known as Gill Herbert, in the 2000 anime series Android Kikaider - The Animation. He subsequently reprised the role of the character, this time as Gill Hakaider, in its sequel series, Kikaider-01: The Animation, which followed in 2001. These roles are part of his broader body of work in the mecha and sci-fi genres of anime.

Gregory's voice work also extended extensively into video games. His video game credits include roles in major titles such as Star Wars: The Old Republic, Dragon Age: Origins, Dota 2, and The Bouncer. More recently, he provided the voice for the character Viktor Vektor in the critically acclaimed 2020 game Cyberpunk 2077 and its subsequent expansion, Phantom Liberty.