The only black female billionaire in America, Oprah Winfrey has her own production company called what?

Oprah Winfrey has a powerful voice, and she knows how to use it. The nation's only black female billionaire is the founder of the production studio Harpo Productions. After ending "The Oprah Winfrey Show," the cultural influencer founded her production company along with the Oprah Winfrey Network.

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