The second of three sons of a public accountant father and a nurse mother, John Feir began his career building in McDonald's where he served as a crew. In 1991, he became a production assistant in GMA Network's programs, including "Lunch Date" and "SST: Salo-Salo Together". Years later, he was promoted to producer.

While working as a producer in "Nuts Entertainment", he was unexpectedly became part of the cast when he accepted to play a Bella Flores parody named "Belli Flori". This marked the beginning of John Feir as a comedian and actor. Currently, he is a mainstay in GMA's long-running sitcom "Pepito Manaloto", where he plays Patrick Generoso, the titular character's long-time bestfriend who is a hotdog-loving glutton.