Steve Jurvetson from Los Altos, USA · CC BY 2.0

Fled Hungary in 1956 at age 20 after the Soviet crackdown on the revolution, arrived in the United States with little English, and became the third employee and eventually third CEO of Intel, building it into the world's largest semiconductor maker. Time named him its 1997 Man of the Year for his role in the growth of microchip technology and its influence on the wider tech industry.