Board of Directors

Hillstone Environmental is backed by Golden Gate Capital, a leading US private equity firm based in San Francisco. Golden Gate has a diverse portfolio of companies with approximately US $15 billion in committed capital. Their companies are in industrial manufacturing, software, semiconductors, retail, and financial services. Many of their retail companies are household names.

Golden Gate’s investor base is large and stable, focusing on long-term growth. Investors include several prominent universities, charitable foundations, international governments, and international banks.


Board of Directors


Jay Parkinson

Jay is responsible for leading, directing, and executing Hillstone Environmental Partners’ strategy and growth initiatives. Prior to founding Hillstone, Jay was an Operating Executive with Golden Gate Capital focused on investment opportunities in the Energy Services, Infrastructure, and Exploration and Production segments. He previously served as Executive Vice President and Chief Financial Officer at Nuverra Environmental Solutions. Prior to joining Nuverra Jay was a Managing Director in the Energy Investment Banking group at Jefferies and Company where he focused on upstream unconventional oil and gas. While at Jefferies he advised on mergers & acquisitions, joint ventures, and financing transactions in the energy sector.
Jay holds an M.B.A. from Tulane University’s A.B. Freeman School of Business, an M.S. from the London School of Economics, and a B.A. from Georgetown University.


Dave Thomas

Dave Thomas is a Managing Director of Golden Gate Capital, which he joined in 2006.  Prior to joining Golden Gate Capital, Mr. Thomas worked as a Senior Associate Consultant in both the Chicago and London offices of Bain & Company. Mr. Thomas has a BBA in Finance from the University of Notre Dame (summa cum laude).


Kendall Cowan

Kendall Cowan has over forty years of oilfield infrastructure experience, acting as an investor and operator of numerous private energy companies.  He has served on multiple public and private company boards, was a partner at Coopers & Lybrand, and a senior executive of several publicly traded companies.


David Cowan

David Cowan has extensive experience with Permian water infrastructure.  He was the founder of DACO Operating, which merged a portion of its assets in the Delaware Basin with Hillstone.


Priyesh Ranjan

Priyesh is the CEO of ShaleApps, responsible for developing the corporate and business strategy to develop digital solutions for the oil and natural gas industry.  Prior to joining ShaleApps, Priyesh held positions of increasing leadership at Halliburton and Baker Hughes across strategy, business development, technology solutions, and operations.  He focused on the areas of digital oilfields, unconventional asset evaluation and development, reservoir and asset monitoring, and renewable energy.  Priyesh has also led start-up companies in the past.  He has authored several patents and thought leadership publications in the space of digital energy.  Priyesh is an Electrical Engineer from the University of Oklahoma.