Question: The 2015 San Diego Padres season had a general manager of which former Texas Rangers assistant GM?
Related documents: [0]  [DOC] The 2015 San Diego Padres season was their 47th season in MLB, and their 12th at Petco Park. General Manager A. J. Preller had a busy offseason, acquiring a new starting outfield in Matt Kemp, Justin Upton, and Wil Myers, while adding to an already strong bullpen with All-Star closer Craig Kimbrel. The Padres also signed free agent starting pitcher James Shields. San Diego traded away seven of its top 11 prospects, as rated by Baseball America entering the offseason. [END] 
[1]  [DOC] A. J. Preller is the general manager of the San Diego Padres Major League Baseball club. He was hired by the Padres on August 5, 2014 while serving as the assistant GM for the Texas Rangers. [END] 
Answer: 
A. J. Preller
A. J. Preller