Christiansen was born in
Omaha, Nebraska and attended
Elkhorn High School. He is an alumnus of
Cameron University. He was signed by the
Pittsburgh Pirates as an amateur
free agent in 1991, Christiansen made his Major League Baseball debut with the Pirates on April 26, 1995. Christiansen gained national attention for his heated rivalry with fellow
San Francisco Giants teammate
Barry Bonds during the 2005 season. The rivalry was documented in the 2006 book
Game of Shadows. Christiansen was traded to the
Los Angeles Angels of Anaheim on August 30, 2005, for minor league pitchers
Dusty Bergman and
Ronnie Ray. On December 13, 2007, he was named in the
Mitchell Report to the Commissioner of Baseball of an Independent Investigation Into the Illegal Use of Steroids and Other Performance Enhancing Substances by Players in Major League Baseball. Christiansen is the CEO & co-Owner of Rigid Industries LED Lighting, Inc., a manufacturer of high end LED lighting systems. ==See also==