Unreasonable Mentors
Billy Parish
Founder & Executive Chair, Mosaic
Billy is an Unreasonable Mentor. Billy has participated in 2 programs, including Unreasonable Impact Americas 2023, and has advised over 30 Unreasonable companies.
Billy Parish is Founder and Executive Chairman of Mosaic, one of the largest clean energy finance companies in the U.S. Mosaic has funded over $14 billion in loans to help more than 400,000 households adopt solar, batteries, heat pumps and other sustainable home improvements.
In 2002, Billy founded a student climate organization called the Energy Action Coalition and grew it to over 300,000 members. He was lead architect of a proposal to create a Clean Energy Corps, which was incorporated into the American Recovery and Reinvestment Act in 2009.
He was elected as a Fellow by Ashoka, the global association of the world's leading social entrepreneurs, and his book Making Good: Finding Meaning, Money & Community in a Changing World is an Amazon bestseller. He lives in Washington, DC with his wife and two daughters.