Kingsbury was born in London, and began to paint in oils from the age of nine. He obtained a BA (Hons) in Psychology from the University of Wales in 1982, where he also studied art history.  Continuing the latter subject in London, he then took up a student internship at the Peggy Guggenheim Museum in Venice (1983), subsequently working as a cataloguer for Bonhams Fine Art in London.

After another long visit in Venice (1986) concentrating on painting architecture, he moved to Scotland, where he remained for five years. 

From Dumfriesshire, he came to west Cornwall in 1991, where he now lives with his wife, the abstract painter Morag BALLARD, and their two children.

During the 1990s Kingsbury enjoyed a succession of solo shows at Francis Kyle Gallery in London, and more recently has been represented by Panter & Hall, also in the capital. His work is shown annually at the Royal West of England Academy, and he has also exhibited at the Royal Academy of Arts, The New English Art Club and the Royal Society of Portrait Painters.