Signed to the Stax record label during the 1960s and 1970s, Hayes played an important role in shaping the "Memphis sound". First active for the label as musician and later songwriter/producer (usually teaming up with David Porter), he enjoyed his biggest success as a solo artist in 1971 with the soundtrack to the movie Shaft. He was inducted into the Rock & Roll Hall of Fame in 2002.
As an actor, he is best known as the voice of Chef on the animated tv-series South Park (1997-2006).
He is also the reason why I couldn't listen to soul music when I was growing up... My father found my Shaft album... He smashed it right in front of me. Something about, "He's a bad mother...shut your mouth!"
Compared to rap these days... Oh well. Here's to Isaac Hays.
Info from Discogs website.