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Today the Gates Foundation celebrates its 25th anniversary by announcing its plans to close up shop. Established in 2000 — when Melinda French Gates was just 35 and Bill Gates was 44 and the world’s richest man — the foundation quickly became one of …

The billionaire philanthropist says he will accelerate his giving — but then dissolve his organization in 20 years, decades earlier than he originally planned.

On Dec. 27, Bill Gates, the billionaire philanthropist, made a trip to Mar-a-Lago for dinner with Donald J. Trump. Some people around him were surprised that he had decided to go, but Mr. Gates wants to talk to whoever will listen. The dinner lasted …

On the top floor of a building near Union Square, there’s a small, white-walled office filled with frazzled 20-somethings munching on Cinnamon Crunch and jelly beans. A whiteboard with a countdown calendar is marked off in red. On a shelf nearby, a …