MARVIN JEROME HUPART Fairfax School Teacher Marvin Jerome Hupart, 51, a history teacher who taught in Fairfax County high schools for 27 years, died of cancer July 13 at Mount Vernon Hospital. Mr. Hupart, who lived in Alexandria, was born in Newark, N.J. He graduated from Rutgers University and earned a master's degree in education at the University of Virginia. After two years in the Army, he moved to the Washington area in 1961 and joined the staff of the Fairfax school system. Mr. Hupart taught history at Groveton, Fort Hunt and West Potomac high schools. He was in his second year at Thomas Jefferson High School for Science and Technology when he left teaching because of illness late last year. In 1967 Mr. Hupart was an exchange teacher in England on a Fulbright fellowship. In 1986 he studied Korean history and culture at the Yale Summer Institute on a National Endowment for the Humanities grant. Survivors include his wife, Helen Hupart, and two sons, Daniel and Samuel Hupart, all of Alexandria, and his mother, Anne Hupart of Matawan, N.J.