Kevin Sinnott was born in Sarn, South Wales, to Irish parents. Sinnott began his career as an artist at Cardiff College of Art and Design and the Royal College of Art in London.
Following his studies, he remained in London throughout the 1970s and 1980s. During this time he exhibited at leading London galleries such as Anne Berthoud, Martin Tinney, Angela Flowers, and major galleries internationally including Jan Turner Gallery, Los Angeles, Roger Ramsey Gallery, Chicago and Bernard Jacobson, New York.