Mark Papermaster was the Senior Vice President of Devices Hardware Engineering at Apple from April 2009 until August 2010, when Apple confirmed he left the company for unspecified reasons. It is believed his departure may be related to the iPhone 4 antenna issues.
Prior to Apple, Papermaster was a VP at IBM. IBM filed a suit in November 2008 to stop Papermaster from moving to Apple. That was eventually settled, but Papermaster could not start at Apple until April 2009.