Jessie P. O’Neill, who taught elementary school at Washington area private schools and retired from the Beauvoir School in the District in 2009, died March 14 at her home in Reston. She was 88.

She had pancreatic cancer, said her son John J. O’Neill III.

Mrs. O’Neill spent 14 years working at Beauvoir, an elementary school affiliated with Washington National Cathedral. She taught at the Langley School in McLean from 1964 to 1966 and at the Potomac School in McLean from 1966 to 1970 and again from 1974 to 1993.

Jessie Rose Piccolo was born in New Haven, Conn., and she was a 1945 graduate of Albertus Magnus College there. She received a master’s degree in social work from Columbia University in 1952.

She began a career in social work in Connecticut before she worked as a teacher in Thailand, starting in 1960, and later in Singapore, while accompanying her husband on his State Department assignments.

Her memberships included the League of Women Voters.

Her husband of 41 years, John J. O’Neill Jr., died in 1994. Survivors include four children, Mary Diamond of Falls Church, John J. O’Neill III of Rockville, Barbara Douglas of Leawood, Kan., and Stephen O’Neill of Bethesda; a brother; a sister; and nine grandchildren.

— Michael Livingston II