Keith Diefendorff

Chief Microprocessor Architect, Apple Computer

Keith Diefendorff is currently working on future microprocessor architecture in the Macintosh Product Architecture Group at Apple Computer. Over his career he has worked on many high-performance microprocessors at Motorola, AMD, TI, and the IBM-Apple-Motorola joint microprocessor design center in Austin, TX. At Motorola he was the principal architect of one of the industry's first superscalar out-of-order microprocessors and one of the first to incorporate a SIMD vector instruction set. He was also the chief architect of PowerPC for Motorola for the first five years of that project and was the lead architect of PowerPC's AltiVec vector instruction set at Apple. From 1998 to 2001, Keith was Editor in Chief of Microprocessor Report.