The Oakland A’s today announced their minor league staff assignments for the 2013 season.

Scott Emerson was named minor league roving pitching instructor after serving 10 seasons as a pitching coach in the A’s farm system.  Marcus Jensen, who will manage the A’s affiliate in the Arizona Rookie League for the fifth consecutive season, will also serve as the A’s minor league roving catching instructor.  Nate Brooks will fill the newly created role of minor league rehab coordinator after eight seasons as an athletic trainer.

Steve Scarsone takes over as manager at Triple-A Sacramento after spending the previous two years at Midland.  He has a 410-424 record in six seasons as a minor league manager, which also includes stints with Stockton in 2010 and Kane County in 2009.  Greg Sparks returns to Sacramento for the second consecutive season as hitting coach and Rick Rodriguez, who was the bullpen coach on the A’s major league staff in 2012, will serve as pitching coach.  Brad LaRosa returns as the athletic trainer and Jared Elliot was named strength and conditioning coach.

Aaron Nieckula was promoted to manager at Double-A Midland after seven seasons as a manager with A’s Single-A affiliates.  He has spent the last two seasons at Burlington and has a 489-482 record as manager, which also includes stints with Kane County (2006-08, 10) and Stockton (2009).  Don Schulze returns for his third consecutive season as pitching coach with the RockHounds while Brian McArn takes over as hitting coach after spending the last two seasons in the same capacity with Stockton.  Justin Whitehouse returns as the athletic trainer.

Webster Garrison will return to manage at Single-A Stockton for the third consecutive year.  He has a 465-451 record in seven seasons, including stops at Vancouver (2001), Visalia (2002), Kane County (2003) and Midland (2004, 08).  Jimmy Escalante begins his seventh season as pitching coach in the A’s farm system, his first with the Ports, and Haas Pratt was named hitting coach after three seasons at Kane County (2008-10) and two with Burlington (2011-12).  Travis Tims takes over as athletic trainer and Sean Doran was named strength and conditioning coach.

Ryan Christenson was named manager for the A’s new Single-A affiliate at Beloit, his first minor league managing assignment.  Christenson played for the A’s from 1998-2001 and was a .222 career hitter in 452 games with Oakland, Arizona (2001), Milwaukee (2002) and Texas (2003).  John Wasdin was named pitching coach after spending the last two seasons at Vermont (2011) and Burlington (2012).  Casey Myers will serve as hitting coach after filling that capacity at Vermont (2011-12) and Vancouver (2009-10).  Brian Thorson returns for his 30th season as athletic trainer in the A’s farm system, his first at Beloit.