David Lee Marks (born August 22, 1948) is an American guitarist, singer and songwriter best known as an early member of the Beach Boys, with whom he recorded five studio albums, and of whom he was a member at various points since 1962. Following his initial departure from the band, Marks fronted the Marksmen and performed and recorded as a session musician. Marks was a neighbor of the Wilson family – Brian, Dennis, and Carl Wilson – and a frequent participant at the Wilson family's Sunday night singalongs. Since he did not appear on the 1961 single "Surfin'", the first performance by the band that would become "the Beach Boys", most historians discount him as a true founding member of the group. He officially joined the Beach Boys in February 1962 as its rhythm guitarist, replacing co-founder Al Jardine. Over the following year, he performed on the band's first four studio albums, Surfin' Safari (1962), Surfin' U.S.A. (1963), Surfer Girl (1963), and Little Deuce Coupe (1963), before leaving the Beach Boys in August 1963. He went on to front the Marksmen, worked with acts including Casey Kasem's Band Without a Name, the Moon, Delaney & Bonnie, Colours and Warren Zevon, and studied jazz and classical guitar at the Berklee College of Music and the New England Conservatory. From 1997 to 1999, Marks returned to the Beach Boys for their live performances. In 2007, he released an autobiography, entitled The Lost Beach Boy. In 2012, he reunited with the group to record That's Why God Made the Radio. Marks also joined the band on its 2012 fiftieth anniversary tour. Following the tour's completion, Marks continued working with Wilson and Jardine on Wilson's solo performances and 2015 studio album, No Pier Pressure.