Clark Kellogg Jr. is a former professional basketball player. From 1979 to 1982, Kellogg played for Ohio State University, where he earned All-Big Ten Conference and Most Valuable Player honors. Kellogg was also an McDonald's America

He played in the NBA for the Indiana Pacers. In 1982, Kellogg declared for the NBA draft after his junior year of college and was a 1st round draft pick (8th overall) of the Indiana Pacers. In his first season, he was selected as a member of the NBA All-Rookie Team. He is one of only a handful of rookies in NBA history to average 20 points and 10 rebounds a game. He was much heralded as the next breakout NBA superstar. Converse signed him to an endorsement deal, to release his own Converse "Special K" sneaker. However, he only played three full seasons, and portions of two others, for the Pacers before chronic knee problems forced him to retire.

In June 2010, Ohio Gov. Ted Strickland appointed Kellogg to the university's (Ohio State) board of trustees, where he sits today. As of 2021, Kellogg is the lead college basketball analyst for CBS Sports.