He hit .222 over six seasons from 1998 to 2002 with the Athletics, Arizona, Milwaukee and Texas, earning a World Series ring with the 2001 Diamondbacks, though he didn’t play in the postseason. He retired due to a knee injury after spending 2004 with the Marlins’ Triple-A Albuquerque team and got his bachelor’s degree from Pepperdine that year, majoring in business.
“So I kind of have a little bit of left and right mind working,” Christenson said. “I love numbers and the analytics part of baseball. I love reading a horse racing form. All the numbers fascinate me there. And then I also enjoy the artistic side.”
After working in a mortgage bank north of San Diego, he opened a baseball academy in Georgia. He was planning a larger academy but financing from suburban Fairburn fell through.
Christenson decided to get back into baseball and worked his way up the Athletics organization, managing Class A Beloit (2013) and Stockton (2014), Double-A Midland (2015-16) and Triple-A Nashville (2017). He became Melvin’s bench coach with the A’s from 2018-21, moved to San Diego with Melvin as bench coach in 2022 and associate manager in 2023, then followed Melvin to the Giants this season.
“He is very analytic oriented, and that organization was like that,” Melvin said. “It was a perfect fit at the perfect time. Obviously, I brought him everywhere I’ve gone.”
Christenson restarted flamboyant penmanship in 2014 at Stockton, inspired by the fancy lineup cards of Jerry Narron and Don Wakamatsu, both former managers who also coached. Narron’s creative cards started with Baltimore in 1993, and he appreciates having the imprint of an innovator.
“Imitation is the highest form of flattery, so I appreciate it,” Narron said.
Wakamatsu’s lineup cards gained limelight when Kansas City reached the 2014 World Series.