(born February 9, 1945), is an American electrical engineer born in Quakertown, Pennsylvania.
He was a major contributor to the design of the Motorola 6800 8-bit microprocessor, was part of the small team led by Chuck Peddle that created the MOS Technology 6502, and he designed the 16-bit successor to the 6502, the 65816.
Mensch is the founder, chairman, and CEO of the Western Design Center (WDC) located in Mesa, Arizona.
Prior to founding the Western Design Center in 1978, Mensch held design engineering and management positions at Philco-Ford, Motorola, MOS Technology and Integrated Circuit Engineering.
At WDC, Bill Mensch worked primarily on extending and expanding the 6502 architecture.
His designs are widely used in embedded systems and implantable, electronic, life-support devices.