In 1963, Mann had his first exhibition. His painting
Karen I was featured in the Contemporary Portrait Society show on
Bond Street. His commercial success was slow, though, and he returned to Camberwell in 1967 to become the first ever postgraduate student in their painting school. He then in 1967 moved into the house of friends
Elizabeth Jane Howard and Sir
Kingsley Amis in
Hertfordshire. Mann spent all of his free time painting in their garden. He lived among these friends until 1976, when he married friend and former student Frances Carey. The exhibit featured his "Lemmons bathroom" works, depicting the room of his friends' home. The show was met with success, and was proceeded with his "sketchbook" collection. In 1994, Mann served as co-curator for the
Bonnard at le Bosquet exhibition at the
Hayward Gallery in London. ==Sight and style==