Bill Gates co-founded Microsoft with his childhood friend, Paul Allen, In 1975. Today, he is chair of the Gates Foundation as well as the founder of Breakthrough Energy, an effort to commercialize clean energy and other climate-related technologies, and TerraPower, a company investing in developing groundbreaking nuclear technologies. Through his private office, Gates Ventures, he focuses on Alzheimer’s research and other issues such as healthcare, interdisciplinary education, and technology.