Glen Hill was born in New Bern, NC. After graduating from high school, he joined the U.S. Army. His last tour of duty was Vint Hill Farms Station on the western border of Prince William County, where he served in the U.S. Army Security Agency. He received an Honorable Discharge from the U.S. Army in June 1969. Following his discharge, he became the first African-American to join the Manassas Police Department. While serving there, he continued his education in criminal justice at Northern Virginia Community College. In 1993, he was named Superintendent of the Prince William-Manassas Regional Adult Detention Center. In November 2003, he was elected Sheriff of Prince William County. Sheriff Hill has more than four decades of law enforcement experience in Manassas City and Prince William County. Glen and his wife, Carolyn, have been married since 1974. They have three children and nine grandchildren. Carolyn is a school teacher in the City of Manassas School System.