Jack Tramiel was the founder of Commodore International which produced the Commodore 64 and the Amiga computers.  It was also the company that made the once ubiquitous 6502 processor which powered the Apple // and the Commodore 64.  The Commodore 64 was the best selling computer of all time and the Amiga (which came after his tenure, but from his company) was almost a decade ahead of its time.  I learned to program with Basic on the Commodore 128 and spent a lot of my formative years using the Amiga. 

Jack Tramiel was a ruthless business person who drove a very hard bargain.  His relentless push for prices drove the first major round of the home computer revolution.  He died on Monday at age 83.  He had a great legacy and will be missed.  A great book on Commodore and Jack Tramiel's role in it is Commodore: A Company on the Edge.