Sinofsky began his career at
Maysles Films. As Senior Editor at the company, he worked on commercials and feature films until 1991, when he and
Joe Berlinger formed their own production company, Creative Thinking International. They jointly produced, edited and directed documentary films which have appeared on over 50 critics choice lists, including ''
Brother's Keeper (1992), the Paradise Lost trilogy (1996, 2004, 2011), Hollywood High (2003) and Metallica: Some Kind of Monster'' (2004). The first movie Sinofsky directed, in 1992, was the documentary ''Brother's Keeper
, which tells the story of Delbart Ward, an elderly man in Munnsville, New York, who was charged with second-degree murder following the death of his brother William. Chicago Sun-Times'' film critic
Roger Ebert, in his review of the movie, called it "an extraordinary documentary about what happened next, as a town banded together to stop what folks saw as a miscarriage of justice." The
Paradise Lost trilogy chronicles the inhabitants of a small southern town a year after a series of brutal murders, in a style similar to that of award-winning documentary filmmaker
Errol Morris. Sinofsky and Berlinger's work used various styles, including a paean to
cinéma vérité.
Metallica: Some Kind of Monster covers the heavy metal band
Metallica as they participate in group therapy before recording their first album in five years. The pair also made a documentary on the southern record label for blues and country western artists, Sun Records called ''
Good Rockin' Tonight''. ==Death and tributes==