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.\n', '

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.\n', '

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.\n', '

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