. >> reporter: private investor tom steyer and his wife, kat taylor, are also giving back.lthy san francisco couple has promised their fortune to nonprofit organizations. >> we hope that the pledge will be a symbol of people reconnecting to the idea of service to the country and their communities. >> reporter: they launched a community bank called one california three years ago to provide alon loan for affordable housing and small business in low-income neighborhoods. >> especially when we're in tough times to remind each other that we are, you know, part of one society, something that we feel strongly about. >> reporter: they also feel strongly about i environment, starting a ranch that raises grass-fed cattle and backing research into clean tech energy. >> sustainable banking, sustainable food, and sustainable energy are critical to every person who walks this planet. and they can be giant vectors for change, for positive change. >> reporter: all of the pledgers say they've had many inspirations over the years. the lee cooperman says he likes this quote from winston churc