He has played at the major league level for the Colorado Rockies, St. Louis Cardinals, and San Diego Padres.

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.

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.