Paul Gardner Allen (January 21, 1953 – October 15, 2018) was an American business magnate, computer programmer, researcher, investor, and philanthropist. He is best known for co-founding Microsoft Corporation with his childhood friend Bill Gates in 1975, which helped spark the microcomputer revolution of the 1970s and 1980s. Microsoft went on to become the world's largest personal computer software company. Allen was ranked as the 44th-wealthiest person in the world by Forbes in 2018, with an estimated net worth of $20.3 billion at the time of his death. Allen and Gates formed Microsoft in 1975 in Albuquerque, New Mexico, and began marketing a BASIC programming language interpreter, with their first employee being high school friend and collaborator Ric Weiland. Allen came up with the name of 'Micro-Soft', a combination of 'microcomputer' and 'software'. (Source: Wikipedia.org, CC BY-SA)