John Nassari first became interested in photography at the tender age of 13 when his stepfather gave him his first camera. After earning a degree in advertising photography from the then called Medway College 1991 (now called University of the Arts), he pursued a career in advertising and editorial photography. John followed the academic path throughout much of his career. He completed an MA in Visual Culture at Middlesex followed by a PhD the University of East London and spent many years teaching at university level.

He was a finalist of the Taylor Wessing Photographic Portrait Prize in 2000, 2006 and 2013, where his work was exhibited at the National Portrait Gallery.

He won Best Photographer 2021 and Best Videographer 2022 at Bridelux UK, and was shortlisted by the Evening Standard in 2016 as one of the Top 13 Wedding Photographers in London.

In 2020, John was honoured to exhibit in space in the first-ever exhibition in orbit above the planet in the Portrait of Humanity project.