Billy is co-founder of the Energy Action Coalition and co-founder and CEO of Mosaic. Through his contributions, the Energy Action Coalition has become the largest youth advocacy organization in the world focusing on climate change issues. He has brought together over 50 organizations, encouraged 600 colleges to commit to lowering their carbon footprints and trained thousands of young people to become more aware of climate issues. Billy also developed a proposal to create a Clean Energy Corps to produce five million green jobs.
As CEO of Mosaic, he is leading the first peer to peer lending platform for solar power by providing people the opportunity to borrow and invest against solar power.
Billy has been named as Rolling Stone magazine’s “Climate Hero”, an Utne Reader's “50 Visionaries Who Are Changing Your World” and was elected as an Ashoka Fellow. Billy is co-author of “Making Good: Finding Meaning, Money & Community in a Changing World.”