He played six seasons in Major League Baseball with the Oakland Athletics (1998–2001), was traded to the Arizona Diamondbacks for the second half of the 2001 season, and played one season each with the Milwaukee Brewers (2002) and the Texas Rangers (2003). After his playing career ended, he began managing in the Oakland Athletics\' farm system. He was promoted to Oakland\'s coaching staff for 2018.\n', '

Christenson attended college at Pepperdine University and was drafted by the Oakland Athletics in the 10th round of the 1995 Major League Baseball draft. He played in his first professional season that year for the Class A Short Season Southern Oregon A\'s. In 1996, he played for Southern Oregon and the Class A West Michigan Whitecaps. In 1997, he advanced to the Class A-Advanced Visalia Oaks, Double-A Huntsville Stars, and Triple-A Edmonton Trappers. He began the 1998 season at Triple-A, but was called up to the Athletics and made his major league debut on April 20. Christenson started out the 1999 season in Oakland, but was sent to the Triple-A Vancouver Canadians for a month after going 3–9 at the plate. He returned to the big league club in late May. He spent the entire 2000 season with the A\'s. He played seven games at the start of the 2001 season with Oakland before being sent to the Triple-A Sacramento River Cats.\n', '

On June 19, 2001, Christenson was traded to the Arizona Diamondbacks for Rob Ryan. He played four games with Arizona, but was then optioned to the Triple-A Tucson Sidewinders. He was recalled to the majors at the September roster expansion.\n', '

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