Marshall Thompson (born August 24, 1942), is an American singer and musician. Thompson is best known as an original member of the Chicago, Illinois–based Soul/R&B vocal group The Chi-Lites. Their songs included Pop and R&B hits" Oh Girl", "Have You Seen Her", "The Coldest Days of My Life (Part 1)", "Stoned Out of My Mind" and "(For God's Sake) Give More Power to the People". Twenty-one of their recordings appeared on the Billboard Hot 100 Pop Chart and thirty-nine appeared on Billboard Soul/R&B Chart, with 11 making the Top Ten list.