Margaret R. Pepper, 88, a former teacher and public school administrator who was executive assistant to the superintendent of the D.C. Public Schools from 1947 to 1960, died at the Bethesda Carriage Hill nursing home Nov. 14 after a stroke. She lived in Washington.

Miss Pepper began her teaching career in the Alexandria public schools in 1914 and transferred to the D.C. Schools two years later.

She taught at Cranch, Force, and Adams elementary schools.

From 1926 to 1928, she was teaching principal at the Brookland school, and was administrative official at several other institutions before serving as principal of Lafayette School from 1942 to 1947.

She was named executive assistant to the superintendent, Dr. Hobart M. Corning, later that year.

During her years as executive assistant, she helped guide the D.C. schools through the difficult times of desegregation. She chaired committees on pupil transfers, special education, and school health services.

She retired in March 1960, as executive assistant to Dr. Carl F. Hansen.

Miss Pepper was a native of Washington. She was a graduate of the old Western High School and the old Wilson Normal School. She earned bachelor's and master's degrees at George Washington University.

She was a member of the board of Washington Hospital Center's nursing school and was a past president of the D.C. Lung Association. She was a member of the 20th Century Club.

Survivors include a sister, Frances W. Pepper, a retired lieutenant colonel in the Marine Corps reserves, of Washington.