Barbara O'Neil Hogan, 70, a retired biology professor at Trinity College and a former member of the D.C. Democratic State Committee and the Advisory Neighborhood Commission in Ward 7, died of heart ailments June 24 at her home in Washington.

Mrs. Hogan was born in Toms River, N.J., and grew up in Washington. She graduated from Immaculata Preparatory School and Trinity College. She earned a master's degree in microbiology at Catholic University.

She lived in Seattle during the early 1950s and returned to Washington in 1956. She joined the faculty at Trinity in 1963 and retired in 1972.

She was an author of a book on environmental concerns called "99 Ways to a Simple Lifestyle."

Mrs. Hogan was a member of the D.C. Democratic State Committee for Ward 7 from 1976 to 1980, and a Ward 7 ANC commissioner from 1978 to 1981. She had belonged to the Center for Science in the Public Interest, the D.C. League of Women Voters and the East-of-the-River Meals-On-Wheels Program, of which she was a past president. She also was a member of St. Francis Xavier Catholic Church.

Survivors include her husband, Dr. Raymond L. Hogan of Washington; two sons, Raymond Jr., of San Francisco and Thomas, of San Leandro, Calif.; one daughter, Elizabeth Hogan of New York City; two brothers, Paul O'Neil of Bethesda and John O'Neil of Friday Harbor, Wash.; one sister, Nora Lambourne of Ireland, and two grandchildren.