Billy Parish

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Billy Parish
Billy Parish
Billy Parish

(1981-09-11) September 11, 1981 (age 40)
NationalityUnited States
CitizenshipUnited States
Alma materYale University, The Mountain School
  • Co-founder & CEO of Mosaic
  • author
  • activist
Years active2003 - present

Billy Parish (born September 11, 1981) is an American environmental entrepreneur, author, and activist. He is the co-founder and CEO of Mosaic Inc., a leading financing platform for U.S. residential solar and sustainable home improvements.[1] Mosaic recently received a $220 million equity investment from private-equity firm Warburg Pincus[2] and was named one of the 10 most innovative companies in energy by Fast Company in 2013 [3] and 2014.[3]

Early life[edit]

Parish grew up in Manhattan, New York City. His father, a lawyer, specialized in finance for electronic utilities. His mother, also a lawyer, met his father while working on a securitization deal. [4]He spent a semester of high school at The Mountain School in Vermont, where he was turned on to working for the environment.[5] In July 2005 he led a three-day fast in front of the White House to draw attention to the 150,000 deaths caused each year by climate change.[6] He designed his own major in sustainable economic developments at Yale University. [4] However, in 2002, he left Yale University and went on to found the Energy Action Coalition, renamed the Power Shift Network.[7] The Coalition became the largest youth-led clean energy advocacy network in the world, bringing together 50 environmental and social justice groups and over 340,000 members.[8] The coalition raised nearly $10 million in four years and helped more than 600 colleges make commitments to climate neutrality.[8]

In March 2009, the Energy Action Coalition organized Power Shift '09, which brought over 12,000 young people to Washington D.C. for the largest climate-focused training, lobby day and non-violent civil disobedience action in U.S. history. 1Sky states Parish is on the Board of Directors.[7] He is also co-chair of SolarAPP+ and board member and former board chair at The Solutions Project.[9][10]


Parish played a leading role in creating the Clean Energy Corps proposal to create 5 million new green jobs in the U.S.,[8] which was incorporated into the American Recovery and Reinvestment Act in 2009. He also helped to expand the AmeriCorps public service program to include a new “Clean Energy Service Corps”.[11] with the idea that crowdfunding could affect a shift to green energy, Parish co-founded Mosaic. At that time, the company allowed individuals to invest as little as $25 in community-scale solar projects.[12] In 2014, Parish shifted the company’s focus from crowdfunding to financing for residential solar projects, and in 2018, expanded to sustainable home improvements.[13]

Personal life[edit]

Billy lives in Washington, D.C. with his wife and two daughters.

Awards and honors[edit]


Parish has written over 50 articles for publications Inc., The Atlantic, HuffPost, and Grist.

  • Making Good: Finding Meaning, Money & Community in a Changing World (ISBN 978-1605290782)


  1. ^ Litvak, Nicole. "U.S. Residential Solar Financing 2016-2021". Greentech Media. Retrieved December 1, 2016.
  2. ^ Chernova, Yuliya. "Warburg Pincus Leads $220 Million Round for Solar Lender Mosaic". Wall Street Journal. Retrieved August 10, 2016.
  3. ^ a b "The Most Innovative Companies of 2013 by Sector". Fast Company. Fast Company. Retrieved September 4, 2016.
  4. ^ a b Cardwell, Diane (September 2, 2013). "A Bet on the Environment". The New York Times. Archived from the original on March 20, 2021. Retrieved April 24, 2021.
  5. ^ " Interview". Archived from the original on January 5, 2009.
  6. ^ Rolling Stone, November 3, 2005
  7. ^ a b "Board of directors". Archived from the original on August 21, 2008.
  8. ^ a b c Kamenetz, Anya. "Climate Change Power Shift". The Nation. The Nation.
  9. ^ "Billy Parish, President of Mosaic". The OGM. Retrieved January 5, 2022.
  10. ^ "Watt It Takes: The Origin Story of Mosaic With Billy Parish". Green Tech Media. Retrieved January 5, 2022.
  11. ^ Ross, Alice (November 9, 2020). "Green entrepreneurs look to make money and a difference". Financial Times. Archived from the original on February 12, 2021. Retrieved April 24, 2021.
  12. ^ "The Fossil Fuel Resistance: Meet the New Green Heroes". Rolling Stone. April 11, 2013. Archived from the original on January 25, 2021. Retrieved April 24, 2021.
  13. ^ "Mosaic, Freedom Forever Partner on Residential Solar Financing". Solar Industry magazine. Retrieved January 5, 2022.
  14. ^ Vision Award | Center for Social Entrepreneurship. (2015-08-13). Retrieved on 2015-08-13.
  15. ^ Cohan, Ellen (March 3, 2015). "Billy Parish". Climate One. Retrieved July 1, 2020.
  16. ^ "New Leaders Initiative 2004 Award Winners" Archived July 25, 2011, at the Wayback Machine, Earth Island Institute. Retrieved 29 December 2010.