His famous psychedelic posters of Bob Dylan, Donovan and others rank as classics of the genre, alongside the work of Rick Griffin, Hapshash and the Coloured Coat and Milton Glaser. His covers, cartoons and illustrations were a central feature of Oz magazine, both in Australia and in London. Martin also co-wrote one of Cream's most famous songs, "Tales of Brave Ulysses", and in the 1970s he became a champion of singer Tiny Tim, and of Sydney's embattled Luna Park.
