Oprah Winfrey:
Media mogul and entrepreneur Oprah Winfrey is certainly no stranger to the list. With her own cable network, a successful acting career, her Harpo production company, her self-titled magazine and several other business ventures, Ms. Winfrey has an estimated net worth of $3 billion. Coming in the No. 12 spot, Winfrey is also known for her philanthropic work which includes her own school for young girls in South Africa and her generous contributions to HBCUs.