Americans set a new record for generosity last year. We gave a total of nearly $300 billion. But few of us could match the generosity of Richard Semmler. Semmler is a 61-year-old math professor at Northern Virginia Community College. He's also a maintenance man, and a book editor. His hard work earns him more than $100,000 per year, but he lives very modestly. 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 -- between 50 percent and 60 percent of his income each year -- to six charities, and his money helps to feed the homeless and build houses for families in need. Semmler's not just writing checks -- he's getting his hands dirty, building those homes with Habitat for Humanity, and handing out food in soup kitchens. I prefer to live in a small apartment. I prefer to drive an old car," he said. "I get a lot of satisfaction out of that. I get a chance to see my dollars at work. For me, it's a personal satisfaction in seeing the house built, but more important, it's personal satisfaction in seeing a family that truly needs this," said Semmler. [He] belongs to a very exclusive club that anyone can join. It's called the Fifty Percent League. Members give away at least half their income to charity. Not all of the donors have big incomes. One woman earned just $16,000 dollars last year, and gave half of it away to help newly arrived immigrants. The group is made up of about 100 people and growing. Collectively, they have given away more than $1 billion over the past decade. Millionaire David Ludlow is a fifty-percenter, who funds an after-school program in Boston's inner city. "This has made me a truly happy man, being able to do this. It's been magnificent. It's totally turned my life around," Ludlow said.