Richard Semmler, a mathematics professor at Northern Virginia Community College, in Annandale, works two additional jobs so he can earn enough money to give away half of his $100,000 income each year.

In addition to his financial donations, Mr. Semmler volunteers with some of the charities he supports, including Central Union Mission, in Washington.

In this video, he talks about his commitment to Central Union, which works with homeless people, and how giving at this level affects his way of life.

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