This document summarizes Bill Gates' contributions to computer science through Microsoft. It discusses how Gates co-founded Microsoft and grew it into the worldwide leader in software. It highlights how Gates inspired home computing through the PC and introduced Microsoft Windows and user-friendly software. It also describes how Gates built the world's largest software business through technological innovation, business strategy, and competitive tactics. Gates took Microsoft public in 1986 and became a billionaire in 1987. Along with his wife Melinda, Gates also founded the philanthropic Bill & Melinda Gates Foundation.