Simon Ramo, American physicist and engineer (died 2016)

Simon "Si" Ramo was an American engineer, businessman, and author. He led development of microwave and missile technology and is sometimes known as the father of the intercontinental ballistic missile (ICBM). He also developed General Electric's electron microscope. He played prominent roles in the formation of two Fortune 500 companies, Ramo-Wooldridge and Bunker Ramo Corporation.