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Richard Semmler is a math professor, a maintenance man and a book editor.

"There are a few personal sacrifices, it means very few vacations, and it means working many extra part-time jobs to make this all happen," Semmler says.

Even with three jobs, Semmler lives in a tiny apartment. He's not working so hard to get more — he's working to give more. Semmler has donated nearly $1 million to six charities, and his money is feeding the homeless and building houses for families in need.