Marc Tremblay is a distinguished engineer at Microsoft. Prior to joining Microsoft in April 2009, he was senior vice president and chief technology officer of the microelectronics business unit at Sun Microsystems. He was instrumental in the design of various microprocessors at Sun, including the UltraSPARC, UltraSPARC II, MAJC, UltraSPARC T1, and the cancelled Rock processor. In the process, he has been awarded more patents than any other Sun employee.