Pratt married fellow sculptor Virginia Claflin while they were students at the School of the Boston Museum of Fine Arts. The couple moved to Seattle in 1925, and Pratt began teaching at the University of Washington's School of Art. After Virginia's death in 1952, Pratt relocated to Croton Falls, New York, where he met and married the painter Colette (Finch) Halvorsen. In 1965, the Pratts moved to San Miguel de Allende, Mexico; Pratt died there in 1975.
^ abWamberg, Bonnie (November 1949). "What's New on the Campus?". Washington State Alumni Powwow. Vol. XXX, no. 2. Pullman, Washington: Alumni Association of The State College of Washington. pp. 1, 3, 5–8. Archived from the original on August 13, 2020. Retrieved February 18, 2024.