Our Leadership Team

Guided by veteran executives who pioneered the RNG space,

Viridi’s team is a leader in waste-to-energy project development. Collectively, the team has more than 100 years of experience developing and operating energy assets and has successfully developed more than 30 RNG projects.
With significant equity backing led by Warburg Pincus and additional funding from Green Rock Energy Partners, we are well-positioned to identify strong opportunities and invest quickly, leveraging our expertise and capital to unlock greater value.

Andy Kelleher

Executive Chairman

Dan Crouse

Chief Executive Officer

David Barry

Chief Financial Officer

Andy Kelleher is a seasoned energy executive with significant experience in the trading sector. In addition to his strategic leadership role as Executive Chairman at Viridi, Kelleher is co-founder and Managing Partner of Green Rock Energy Partners. Previously, he held senior positions at Glencore, JP Morgan and ConocoPhillips.
With more than 15 years of experience in the landfill gas-to-RNG industry, Chief Executive Officer Dan Crouse joined Viridi in 2022 from Air Liquide, where he was responsible for development, construction, and operations activity across the United States. He also served as CEO of Air Liquide Advanced Technologies, U.S., overseeing all U.S.-based RNG businesses. Previously, Crouse led Keystone Renewable Energy, a closely held business focused on biogas development, where he was CEO.
David Barry is the CFO of Viridi Energy, where he brings over two decades of leadership experience in energy, sustainability, and finance roles. Prior to joining Viridi, he served as CFO of Northern Biogas, LP, a developer and owner of renewable natural gas projects. He also held the role of CFO at Viking Pure Solutions, where he helped build an innovative business at the intersection of healthcare and sustainability.

Earlier in his career, David spent 14 years as an investment banker, advising on transactions across the energy and industrials sectors.

He holds an MBA from the University of Chicago and an AB from Harvard College. David lives in Denver, Colorado.

Mark Cresanti

Executive Vice President

Jake Crouse

Executive Vice President

Dana Husnay

Executive Vice President

Mark Cresanti joined Viridi with more than two decades of operations leadership experience and several recent years of work in the biogas-to-RNG space. From 2020 to 2023, he was Director of Operations for RNG Operating Assets at Air Liquide Advanced Technologies, responsible for managing the operations team supporting new and existing biogas-to-RNG projects nationwide. Prior to that, he was the Northeast Director of Operations for the same firm and also worked for The Dow Chemical Company.
Jake Crouse has worked in the landfill gas-to-RNG industry for the past 19 years and was responsible for nine landfill gas-to-RNG projects, overseeing each project from development through to operations. Crouse was previously the Vice President of Investment Development for Archaea Energy, Director of Biogas for Air Liquide, and President of Keystone Renewable Energy.
Dana Husnay joined Viridi from Air Liquide Advanced Technologies, where he was responsible for all U.S. biogas operations in his role as Director of Operations and Risk Management. Husnay also worked as Director of Operations with Archaea Energy, where he managed engineering activities related to gas separation membrane technology.

Bill Keller

Executive Vice President

Evan Kirchen

Executive Vice President

Dan Shirley

Vice President

Bill Keller brings to Viridi more than 15 years of diverse RNG experience, including specialization in advanced gas processing technologies and equipment. His previous employment includes Air Liquide, Archaea Energy, and Unconventional Gas Solutions. Keller has honed expertise in management, development, manufacturing, and sales, in addition to RNG offtake projects and project development.
Prior to joining Viridi, Evan Kirchen was CEO of Orbital Renewables for 3 years, delivering investment-grade RNG projects from a wide variety of feedstocks throughout North America. Kirchen also has over 20 years in the natural gas processing sector. He served as VP of Engineering & Construction at Williams, leading a $6 billion capital asset expansion project.
Dan Shirley joined the Viridi team after a lengthy career in tax-related roles across the energy and infrastructure sectors. Most recently, he worked as the outsourced tax director for a publicly traded regional bank and as Senior Advisor to a newly launched energy and infrastructure firm. Previously, he was Head of Tax at Rice Energy. Before that, he was a tax partner at one of the “big four” accounting firms, focused on state and local tax and tax credits across the energy and financial services spaces.

Jared Hopkins

Vice President of Asset Management

Peter Fenelon

VP of Finance

Tamara Siskind

Director of Business Development

Jared Hopkins brings more than two decades of renewable energy, business operations, and facilities management experience to the Viridi team. His previous roles include Director of Business Transformation at Air Liquide, Director of Project Development at Archaea Energy, and most recently, Managing Partner at Polaris Energy Partners. As VP of Asset Management, Jared collaborates with the Project Development, Execution, and Operations teams to optimize efficiency and profitability across our portfolio of projects.
Peter Fenelon joins Viridi following a succession of sustainable finance and energy sector investment banking roles. Peter’s expertise in RNG investment banking, M&A, and capital markets advisory services, as well as his successful track record in managing multi-million-dollar transactions, will significantly contribute to Viridi’s growth and investment strategies.
Prior to joining Viridi, Tamara Siskind led U.S. sales for Wärtsilä's Puregas CA biogas upgrading technology. Her experience also includes more than 10 years as an engineer in the oil & gas sector, with roles spanning operations, commissioning, and capital project development. Prior project experiences include facility scoping for a grassroots petrochemical plant in Southeast Asia and commissioning of gas treating equipment for an offshore oil platform at the DSME Shipyard in Okpo, South Korea.

Joshua Bush

Project Director

Andy DiFonso

Senior Project Developer

Joshua Bush brings more than two-and-a-half decades of management, engineering, design, and construction expertise to Viridi. With a five-year track record working specifically in the renewable energy space, he also has experience in the petrochemical, refining, natural gas, wastewater, manufacturing, and paper mill industries. In his previous role as Regional Construction Manager at Montauk Renewables, Bush helped lead the successful development, construction, and commissioning of new RNG facilities, while also supporting existing assets nationwide.
Andy DiFonso has been active in the landfill gas-to-RNG industry for the past 11 years. Before joining Viridi, he was Lead Project Manager of all development activities for more than 10 landfill gas and AD projects. DiFonso previously worked with Air Liquide as a Biogas Project Developer and Venture Engineering as a mechanical engineer.