David Edwin Duncan is an American pitching consultant for the Arizona Diamondbacks of Major League Baseball. He is also a former professional baseball catcher and pitching coach. He began his MLB playing career in 1964 and played again consecutively from 1967 to 1976 for the Kansas City/Oakland Athletics, Cleveland Indians, and Baltimore Orioles. After retiring as a player, Duncan served as the pitching coach for the Indians, Seattle Mariners, Chicago White Sox, Athletics, and St. Louis Cardinals. Four pitchers he coached won the Cy Young Award in 1983, 1990, 1992 and 2005. He was also a member of four World Series champion teams in 1972, 1989, 2006, and 2011. Each year from 1986 to 2011, Duncan worked with former manager Tony La Russa on the White Sox, Athletics, and Cardinals. Following the 2013 season, he became a pitching consultant for the Diamondbacks. 

September 26th, 1945 in Dallas (Age 79)