He moved back to Toronto in 1965 and worked as a painter, illustrator, photographer and graphic artist in the advertising and magazine editorial fields.  His advertising career included positions as production manager and art director.  His photography, illustration and graphic design skills led to the field of magazine production as a photojournalist for Maclean's magazine and many other Maclean-Hunter trade publications.  He also did photography and design for Quest and Homemaker's magazines, then worked for Program Guide and Financial Post magazine doing layout and page design.

Peter had his first exhibition in 1970 at the Nightingale Gallery in Toronto.  In 1990 he moved to the Quinte region and dedicated his time to painting.  In Belleville, he was a founding member of Gallery One-Twenty-One, an artists' co-operative gallery.  He has had three exhibitions at the Belleville Public Library Gallery - in 1990, 1993 and 1999.

His artwork hangs in private collections in Canada, Bermuda, the U.S., England, Sweden, New Zealand.  His work has been chosen by numerous juried exhibitions, including the Quinte Arts Council's Expressions and Unbridled, and the Prince Edward County Arts Council's Art in the County, where he was selected for one of the Jurors' Awards.

For the past 15 years, Peter has designed Umbrella, the Quinte Arts Council's bi-monthly arts newspaper.

Peter Davis currently resides and maintains a studio on the Bay of Quinte in Prince Edward County.