Gary Joseph Lachman, also known as Gary Valentine, is an American writer and musician. He came to prominence in the mid-1970s as the bass guitarist for rock band Blondie. Since the 1990s, Lachman has written full-time, often about mysticism and occultism.

Blondie is an American rock band formed in 1974 in New York City by singer Debbie Harry and guitarist Chris Stein. The band was a pioneer in the American new wave scene of the mid-1970s in New York City.