15) Jerry Reinsdorf (Net worth: $1.3 billion)

Jerry Reinsdorf is the owner of Chicago Bulls and Chicago White Sox. This 79-year-old self-made billionaire bought these teams in the 1980s. He has seen his wealth increase as the value of his sports teams skyrocketed over the years.

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14) Markus “Notch” Persson (Net worth: $1.3 billion)

Swedish video game programmer and designer Markus Persson is the founder of the video game developer Mojang. He is also the founder of sandbox independent video game Minecraft. The company has sold more than 100 million copies of Minecraft.