Colonel Hayden Mason, 91, died on May 9. Born in Westfield, N.J., he graduated from Haverford College and was a Ph. D. candidate in Romance languages at Harvard University.  He earned the rank of Colonel in the U.S. Army.  Col. Mason was an accomplished musician along with his late wife Jean Trace Mason.  He was an avid sailor and honorary member of the Bar Cove Power Squadron, having served as an instructor and historian. His career included teaching French at the Taft School, the Cambridge School of Weston, and Lincoln-Sudbury Regional High School. He later worked for the National Fire Protection Association and then at the Charles T. Main Company.  He raised champion golden retrievers with his wife and was a longtime member of the Eastern Dog Club.

Col. Mason leaves Deborah Mason of Duxbury, Dana Mason of Barnstead, N.H., and Diana Mason of Middleboro. A summer gathering of family and friends is planned at Greengate Farm in Duxbury.  Donations may be made in his memory to the Alzheimers Association, 31 Arsenal St., Watertown, MA 02472. .Arrangements by Shepherd Funeral Home of Kingston.