Over the years, Microsoft founder Bill Gates has shifted his day-to-day focus from technology to philanthropy. After all, once you make your billions, the next task is to figure out how to spend it, and Gates has set an admirable precedent. After Gates blazed the trail from celebrity-CEO to philanthropist, founders at Facebook, Google, and a number of other newer tech giants have followed suit.

Taking stock of the scope of Gates’s philanthropic triumphs is a difficult task. He and his wife, Melinda Gates, have had a huge impact on the charitable community in a variety of capacities. The Bill and Melinda Gates Foundation is the world’s wealthiest charitable foundation with a reported $34.6 billion in assets. In the Foundation’s latest annual letter, meant as a 15-year progress report, huge accomplishments were cited in numerous areas, including reducing infant mortality, increasing agricultural yields, eliminating diseases like polio and river blindness, and increasing technology access in impoverished nations.