Carolyn S. Mackenzie

Carolyn S. Mackenzie, 90, a retired psychologist who had a private practice in Washington, died Oct. 4 at a hospital in St. Petersburg, Fla.

She had complications from a stroke, her daughter Susan Mackenzie Runge said.

Dr. Mackenzie, a former Chevy Chase resident, began her clinical psychology practice in the late 1950s and retired in 1996. For years, she also worked as a psychologist for the Peace Corps, interviewing potential candidates for overseas posts.

Carolyn Priscilla Surratt was born in Okmulgee, Okla., and grew up in Texas. She was a 1943 graduate of Northwestern University in Evanston, Ill., with a bachelor’s degree in English and speech. She received a master’s degree in psychology from the University of Chicago in 1946 and a doctorate in human development from the University of Maryland in 1969.

Dr. Mackenzie participated in civil rights activities and volunteered at clinics and homeless shelters. She moved to St. Petersburg in retirement.

Her husband of 59 years, Thayer M. Mackenzie, died in June. Their daughter Louise Thayer Mackenzie died in 1984.

Survivors include two daughters, Susan Mackenzie Runge of Stillwater, Minn., and Betsy Mackenzie Bruvold of White Bear Lake, Minn.; and four grandchildren.

— Matt Schudel