Hackman was selected by Colorado Rockies in 6th round (154th overall) of the 1994 Major League Baseball Draft. He has played at the major league level for the Colorado Rockies, St. Louis Cardinals, and San Diego Padres.
In 2007, Hackman played nearly all of the season with the Nashville Sounds, the Triple-A affiliate of the Milwaukee Brewers. He was released from his contract on August 18, and then signed as a free agent by the Triple-A Oklahoma Redhawks on August 24.
In late October 2007, Hackman was given a 50-game suspension for violating the Minor League Drug Prevention and Treatment Program by testing positive for a performance-enhancing substance.[1]
He signed with Uni-President 7-Eleven Lions of the Taiwanese Chinese Professional Baseball League on July 1, 2008 and became a free agent at the end of the season. Then he joined with Olmecas de Tabasco of the Liga Mexicana de Béisbol in the beginning of 2009 until June 10, 2009.
After June 16, 2009, Hackman returned to the Uni-President 7-Eleven Lions wearing #00 and was named the Most Valuable Player in the 2009 Taiwan Series.
On August 14, 2010, Hackman was warned then later ejected by home plate umpire for repeatedly covering the pitching rubber with dirt.[2]