During the 1960's was heavily involved in magazine publishing, significantly with Oz magazine until 1970.-- Edited POL, in 1968, and edited the Sunday review (later the Nation review) in 1970. Managing director at Angus & Robertson in 1972 and remaining with the firm until 1986. He then became the head of Australian Consolidated Press (ACP) after a short period as the editor of Australian Womens' weekly. Walsh left ACP (now PBL) in 1999 and has since worked as a media consultant and lecturer.