The gallery exhibits contemporary works of art by Canadian, American and European artists. May, 2012 marked 53 years of Gallery Moos in Toronto, Canada.
Walter Moos introduced or has shown to the city a significant number of now well-known artists such as Karel Appel, Walter Bachinski, Paul-Émile Borduas, Ken Danby, Sorel Etrog, Gershon Iskowitz, Alex Janvier, Lester Johnson, Jean-Paul Riopelle, Antoní Tapiès, Michael Thompson, and many more.
He pioneered the concept of the limited edition art book by publishing Ken Danby (1974) and Ken Danby: The New Decade (1984), both by Paul Duval, as well as Gershon Iskowitz: Painter of Light (1982), by Adele Freedman.
A founding member of the Art Dealers Association of Canada, Walter served as president from 1973 to 1975, and was chairman of the appraisal committee from 1972 to 1989. He currently is co-chair of the appraisal committee, and a member of the Board of Directors.
Walter served on the Canadian Eskimo Arts Council from 1972 to 1982, and is founder and past trustee of the Gershon Iskowitz Foundation.
In 2002, he received the Toronto International Art Fair Award of Distinction, and was the honoree at the annual Art Dealers Association of Canada Tribute Dinner.