 After a year at the Banbury School of Art, where he received his first photographic instruction, Kenna applied to the London College of Printing in both the graphic design and commercial photography departments, figuring he would go with the one that accepted him first (he graduated from the latter, in 1976).While pursuing his hobby of landscape photography, he took every chance to practice his craft commercially.He photographed theater dress rehearsals, and for record companies and the press; assisted other photographers, and sold stock photos of Henri Cartier-Bresson, Cornell Capa, Marc Riboud and Jacques-Henri Lartigue for the John Hillelson Agency on Fleet Street.