Dan Haren was a professional baseball player who played as a pitcher for various teams in the Major League Baseball (MLB). He was born on September 17, 1980, in Monterey Park, California, and attended Bishop Amat Memorial High School in La Puente, California.

Haren began his professional baseball career in 2001 when he was drafted by the St. Louis Cardinals in the second round of the MLB draft. He made his MLB debut with the Cardinals in 2003 and played for them until 2004. During his time with the Cardinals, Haren was primarily used as a relief pitcher and had a record of 3-3 with an ERA of 4.50.

In 2005, Haren was traded to the Oakland Athletics, where he had his breakout season. He became a starting pitcher for the Athletics and had a record of 14-12 with an ERA of 3.73. He also made his first All-Star appearance that year. Haren continued to pitch for the Athletics until 2007 and had a record of 43-34 with an ERA of 3.64 during his time with the team.

In 2008, Haren was traded to the Arizona Diamondbacks, where he continued to excel as a starting pitcher. He had a record of 16-8 with an ERA of 3.33 in his first season with the Diamondbacks and made his second All-Star appearance. Haren continued to pitch for the Diamondbacks until 2010 and had a record of 37-26 with an ERA of 3.56 during his time with the team.

In 2010, Haren was traded to the Los Angeles Angels, where he played for two seasons. He had a record of 16-10 with an ERA of 3.17 in his first season with the Angels and made his third All-Star appearance. Haren continued to pitch for the Angels until 2012 and had a record of 33-27 with an ERA of 3.52 during his time with the team.

In 2013, Haren signed with the Washington Nationals, where he played for one season. He had a record of 10-14 with an ERA of 4.67 during his time with the Nationals. In 2014, Haren signed with the Los Angeles Dodgers, where he played for one season. He had a record of 13-11 with an ERA of 4.02 during his time with the Dodgers.

Haren announced his retirement from baseball in 2015 after playing for 13 seasons in the MLB. He had a career record of 153-131 with an ERA of 3.75. Haren was known for his control and ability to strike out batters, as well as his durability as a starting pitcher. He was also a three-time All-Star and won a Silver Slugger award in 2009 for his hitting abilities as a pitcher.