Mary Callahan is a director of the New England Watercolor Society, a Copley Master in the Copley Society of Art, a signature member of Allied Artists of America, NY, Academic Artists, and the Rhode Island Watercolor Society. She is an Artist Member of the Rockport Art Association, The North Shore Art Association, the South Shore Art Center and The Plymouth Guild. Callahan is represented by galleries in the Boston, South Shore, and Cape Cod areas; the North Shore Art and Rockport Art Associations; as well as the DeCordova Museum in their Corporate Program.

Her free, impressionistic paintings have earned over 150 awards from National and Regional Exhibitions and are in the permanent collection of Bridgewater University, the Federal Reserve Bank of Boston, as well as in private collections in the US and in Europe. Callahan teaches watercolor at the South Shore Art Center in Cohasset, MA and at the North River Arts Society in Marshfield Hills, MA.

In 1991, Callahan graduated summa cum laude, from
Bridgewater University, Bridgewater MA