J. K. Rowling

The Harry Potter series became a global phenomenon, transforming Rowling from a struggling single mother to a multi-millionaire in a very short span of time.

Rowling established the Volant Charitable Trust, which supports organizations working with children, single-parent families, and multiple sclerosis research.

Rowling founded Lumos, an international non-profit organization working to end the institutionalization of children worldwide. The name 'Lumos' is taken from a spell in the Harry Potter books.

Due to her extensive charitable donations and tax obligations, Rowling reportedly lost her billionaire status, according to Forbes.