In February 2020, Warren Buffett became the longest-tenured CEO of an S&P 500 company. With a net worth of $90 billion, he is also one of the richest people in the world, something he had been working towards for much of his almost-90-year life.

Les Wexner. JOHANNES EISELE/AFP/Getty Images

Buffett gained the title after Les Wexner, 82, of L Brands, the parent company of Victoria's Secret, stepped down as CEO. Wexner had held the position for 57 years.

Sycamore Partners had recently acquired a majority of Victoria's Secret stocks. Wexner and disgraced financier Jeffrey Epstein reportedly had a close relationship, attracting controversy in the months preceding his resignation.

Buffett has led Berkshire Hathaway for 50 years and amassed a massive fortune starting with business ventures in his teen years.