Brown's work is in the collections of the C. M. Russell Museum; National Cowboy and Western Heritage Museum; and Gene Autry Museum in Los Angeles.

Harley Brown was commissioned to paint Prime Minister Winston Churchill, and has painted many portraits of other well-known persons including President Ronald Reagan.  His painting media include oil, watercolor and pastel.
 

He is a member of the Northwest Rendezvous Artists, Helena, Montana; National Association of Watercolor Artists; Oil Painters of America*; Cowboy Hall of Fame, Oklahoma City, Oklahoma; and Cowboy Artists of America* since 2004.  In 2005, he won two gold medals at the CAA annual exhibition.  He says of membership in the CAA:  "Being allowed to join them is a monumental event in my life." (CA)