This report traces Bill Gates’s journey from Harvard dropout to Microsoft co-founder and personal-computing pioneer—charting how his strategic vision and competitive drive shaped MS-DOS, Windows, and the software industry—then follows his shift to full-time philanthropy through the Bill & Melinda Gates Foundation, detailing major initiatives in global health, education, and climate. It concludes by distilling lessons on visionary leadership, innovation management, and using entrepreneurial success to drive large-scale social impact.