Here are some of the people in the sports world celebrating birthdays on September 21:

Richard Childress
Age: 67
Profession: NASCAR Team Owner
Best Known For: A NASCAR driver from 1969 to 1981, Richard Childress is the current team owner of Richard Childress Racing (RCR), which sponsors cars in the Sprint Cup Series, the Busch Series and the ARCA Racing Series. The late Dale Earnhardt drove for Childress, winning championships in 1986, 1987, 1990, 1991, 1993 and 1994.

Sidney Moncrief
Age: 55
Profession: Retired NBA Player
Best Known For: A five-time NBA All-Star guard, Sidney Moncrief played for the Milwaukee Bucks and Atlanta Hawks from 1979 to 1991. He was named NBA Defensive Player of the Year in 1983 and 1984. Moncrief played college basketball at Arkansas from 1975 to 1979, advancing to the 1978 Final Four. Moncrief and Razorback teammates Ron Brewer and Marvin Delph were known as 'The Triplets.'

Rick Mahorn
Age: 54
Profession: Retired NBA Player
Best Known For: A hard-nosed defensive center, Rick Mahorn played for the Washington Bullets, Detroit Pistons, Philadelphia 76ers and New Jersey Nets from 1980 to 1999. He was a key member of the 'Bad Boys' Pistons of the late 1990s, a team who won the 1989 NBA title and often roughed up opponents.

Cecil Fielder
Age: 49
Profession: Retired MLB Player
Best Known For: A three-time All-Star first baseman, Cecil Fielder played from 1985 to 1998 with the Toronto Blue Jays, Detroit Tigers, New York Yankees, Anaheim Angels and Cleveland Indians. He also played for the Hanshin Tigers of the Japanese league in 1989. In 1990, Fielder became the first MLB player to hit 50 home runs in a season since George Foster in 1977. Fielder was on the New York Yankees' team that won the 1996 World Series. Cecil is the father of current Detroit Tigers player Prince Fielder.

Jimmy Clausen
Age: 25
Profession: NFL Player
Best Known For: Jimmy Clausen plays quarterback for the Carolina Panthers, who selected him in the second round of the 2010 NFL Draft. Clausen played college football at Notre Dame.