Berkshire Hathaway Chairman Warren Buffett officially stepped down today. When he took over in 1965, it was still a textile mill on the verge of collapse. After 61 years, the market value reached $1.09 trillion—up more than 7,700 times, one of the most powerful compounding machines in human history.

The toughest thing about old Buffett’s life wasn’t stock picking—it was waiting. When the market panicked, he kept adding. When the bubble party raged, he clutched cash. Now that the old man has retired, with these valuations in the U.S. stock market, the person who inherits the role—Greg—might be picking up a hot potato.

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