[1] Philip was born in Belfast, the son of Paul Conisbee, but raised in London, being educated at St Dunstan's College in Catford before earning a BA in European Art at the Courtauld Institute in 1968.
[2] Continuing in academia, he received a doctorate for his thesis on the French landscape artist Claude Joseph Vernet in 1971.
He befriended Earl Powell III and moved to California to work with him at the Los Angeles County Museum of Art in 1988.
[3] In 2003, the French government awarded him Chevalier de la Legion d'Honneur.
[4] He died of lung cancer in Georgetown, Washington D.C., but is buried in Highgate Cemetery in north London.