American saxophonist and songwriter Stephen "Doc" Kupka, born in 1946, is best known as a founding member and baritone saxophonist for the iconic funk and soul band Tower of Power. His distinctive horn arrangements and co-writing credits on many of the band's hits have been instrumental in shaping their signature sound since the late 1960s. Kupka's enduring contributions have solidified his place as a significant figure in funk and R&B music.