OAKLAND -- The A's on Tuesday announced a multitude of coaching-staff changes within their Minor League affiliates, most notably at Triple-A Sacramento, Double-A Midland and Class A Stockton -- all of which will feature entirely new personnel for the 2011 season.Leading the way in Sacramento will be Darren Bush, who was promoted to manager of the organization's Triple-A team following two seasons at the helm in Midland that resulted in Texas League championship appearances. He owns a 288-272 managerial record in four seasons in Oakland's farm system, which also previously included two years as manager of Stockton. Joining Bush will be hitting coach Todd Steverson, who was the A's first-base coach on Bob Geren's staff the past two seasons, and pitching coach Scott Emerson, who served in the same capacity for Midland in each of the past four seasons. Steverson is no stranger to the capital city, as he held the managerial role with the River Cats in 2008. Deep in the heart of Texas will be Steve Scarsone, who was promoted to manager of the Midland Rockhounds following a memorable 2010 season in Stockton. It was there he transformed a Ports club that posted a 31-39 record in the first half to a team that won the second half of the California League with a 43-27 mark. The 2011 campaign will mark Scarsone's third season in the A's Minor League system but first at the Double-A level. Scarsone's staff will consist of pitching coach Don Schulze and hitting coach Tim Garland, both of whom worked under Scarsone in Stockton this year. Taking his managerial place in Stockton will be Webster Garrison, the hitting coach for Midland the past two seasons. Garrison carries with him previous managerial experience, having managed Midland in 2004 and 2008, along with other stints in the A's farm system. Joining him in Stockton are pitching coach Craig Lefferts and hitting coach Brian McArn. Meanwhile, Class A Burlington -- recently added as an affiliate to replace Kane County -- will be comprised of the same staff that held the reins at Kane County this year. Other appointments, including staffs at short-season Class A Vermont and the Arizona Rookie League, will be announced when staff assignments have been completed.