Born in New Bedford, Massachusetts, Otis Cook settled in Rockport. He studied at the Swain School of Design in New Bedford and with Emil Gruppe in Gloucester. He was active in the North Shore Art Association, the Guild of Boston Artists, and the Boston Society.

Source: Peter Falk, "Who Was Who in American Art"
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The following is from Joan E. Jacobson whose family has a connection with Otis Cook.

My father, George A. Selley's cousin, Grace Selley (father was Harry Selley) was Otis Cook's wife. According to information from my mother, Grace and Otis lived in Bearskin Neck, Rockport, MA in the late 1930's, 40's and 50's. My mother, Elizabeth White Selley, ...