William Henry Marcus Miller Jr. (born June 14, 1959) is an American musician, songwriter, and record producer. He is best known for his work as a bassist. He has worked with trumpeter Miles Davis, pianist Herbie Hancock, singer Luther Vandross, and saxophonist David Sanborn, among others. He was the main songwriter and producer on three of Davis' albums: Tutu (1986), Music from Siesta (1987), and Amandla (1989). His collaboration with Vandross was especially close; he co-produced and served as the arranger for most of Vandross' albums, and he and Vandross co-wrote many of Vandross' songs, including the hits "I Really Didn't Mean It", "Any Love", "Power of Love/Love Power" and "Don't Want to Be a Fool". He also co-wrote the 1988 single "Da Butt" for Experience Unlimited.

Source: Wikipedia (https://en.wikipedia.org/wiki/Marcus_Miller)