A. Gregory is a professional name used by the American voice actor William Capizzi, who was active in the industry for several decades until his passing in 2007. He was known for his work in numerous English-language dubs of anime series and films, particularly during the 1980s and 1990s.

In the anime film A Journey Through Fairyland, Gregory provided the voices for two distinct characters: Professor Low Note and the goblin Treble. Professor Low Note is depicted as Michael's music teacher, a man who bears a resemblance to a mix of George Darling and King Hubert, and is responsible for Michael's care following the death of the boy's parents.

Beyond this specific role, Gregory's career was marked by a wide range of credits in some of the most iconic anime properties to be localized for an American audience. He was a prominent cast member in the seminal series Robotech, where he voiced numerous characters, including Colonel Maistroff and Konda from The Macross Saga, as well as The Robotech Masters from the eponymous second generation of the series. His other significant anime voice work included roles such as Dr. Mark Sheffield in Captain Harlock and the Queen of a Thousand Years, Major Fist in an early Harmony Gold dub of a Dragon Ball movie, and Captain Henderson in Galactic Patrol Lensman. Later in his career, he also contributed voices to popular series like Digimon Adventure, where he played Frigimon, and Mon Colle Knights. A. Gregory passed away on March 26, 2007, in Scottsdale, Arizona.