Margaret Thomas Rudd, 91, a retired educator who wrote poetry and biographies, died of congestive heart failure Oct. 22 at Goodwin House in Alexandria. She had lived in the Washington area since 1963.

Miss Rudd was born into a Baptist missionary family living in Ponce, Puerto Rico. She was a graduate of the University of Richmond and received a master's degree in languages at Columbia University. She also studied at the University of Mexico and the Sorbonne.

She initially taught French and Spanish at Stuart Hall prep school in Staunton, Va., and then joined the faculty of Blackstone College, where she was also dean. She taught at Stephens College in Missouri and the College of William and Mary before returning to the University of Richmond in the early 1940s. She retired there in 1963 as chairman of the Modern Language Department. She also had taught in Chile.

After moving to Washington, she was a freelance translator and a writer. She wrote biographies of her father, A.B. Rudd; Spanish philosopher and poet Miguel Unamuno; and Chilean writer Gabriela Mistral. She was also co-author of a Spanish textbook and wrote several books of poetry.

Miss Rudd was a founder and president of Virginia Educational Television, an educational broadcasting association in Richmond. She was regional vice president of the Poetry Society of Virginia and a member of American Pen Women, the Virginia Writers Club and First Baptist Church in Annandale.

She received an award of distinction from the University of Richmond.

She leaves no immediate survivors.