Our Team
Sean Coleman
CEO and Portfolio Manager
Sean is the Co-Founder of ESC and Portfolio Manager of the Eyre Street Sustainable Solutions Strategy. He is a member of the firm’s investment committee, leads the firm’s strategic direction, sources key relationships and advises on investment opportunities. Previously, he was the Senior Portfolio Manager on the Avenue Sustainable Solutions Fund from 2021-2025. Sean has also worked at FS Investments, Golub Capital, Goldman Sachs and Wasserstein Perella & Co. He earned a B.A. in History from Princeton University (1992) and an M.B.A. with Distinction from Harvard Business School (1996), where he received the Loeb Award for academic excellence in finance.
Jamie Devine
President and Head of Originations
Jamie is the Co-Founder and Head of Originations at ESC, responsible for originating and analyzing investment opportunities. Previously, he was Managing Director on the Avenue Sustainable Solutions Fund from 2017-2025. Prior to joining Avenue, he worked at J.H. Whitney Investment Management and Kongsberg Gruppen. From 2002 to 2006, he served as an officer in the United States Marine Corps, where he received commendation for valor in combat during the Second Battle of Al Fallujah in November 2004. Jamie received a B.A. in International Relations from Trinity College (2002) and an M.B.A. from the Darden School of Business at the University of Virginia (2008).
YoungSun Lee
Chief Compliance Officer and VP, Finance
YoungSun is responsible for overseeing ESC’s accounting and finance functions and SEC regulatory compliance as a delegated professional from Galway Sustainable Capital (GSC). Prior to joining GSC and ESC, she served as CCO and Director of Finance at LAP Latin American Partners. Previously, she worked at PricewaterhouseCoopers LLP, focusing on audit services, technical accounting, and compliance. She received a B.S. in Accounting from the University of Maryland University College at College Park and a B.S. in Forest Resources from Korea University in Seoul. She also holds a CPA in Delaware, Virginia, and Maryland, and was licensed in 2004, 2006, and 2011.
Esther Pan Sloane
Managing Director
Esther is responsible for ESC’s fundraising, ESG due diligence, and impact reporting. Previously, she was a Managing Director on the Avenue Sustainable Solutions Fund from 2022-2025. Prior to joining Avenue, she was a senior executive at the United Nations Capital Development Fund. From 2006-2016, she was a U.S. Foreign Service Officer serving in bilateral and multilateral posts, including at the U.S. Mission to the United Nations, where she helped to negotiate the UN Sustainable Development Goals. Esther received a BA from Stanford University with honors in both English and International Relations (1997) and an MA in Theatre and Performance from the University of Cape Town in South Africa (2002).
Graham Feldman
Vice President
Graham is responsible for leading analysis of investment opportunities at ESC. Previously, he was a Vice President on the Avenue Sustainable Solutions Fund from 2022-2025. Before joining Avenue, he worked at BlackRock and Miller Buckfire advising sovereign, corporate and buy-side clients through special situations and distress. He received a B.A. in Chinese and Finance from The College of William and Mary, where he graduated magna cum laude (2011), and an M.Sc. in Accounting and Finance from the London School of Economics (2012).
Nathan Wachowiak
Associate
Nate is responsible for credit analysis and portfolio management at ESC. Previously, he was an analyst on the Avenue Sustainable Solutions Fund from 2021-2025. Prior to Avenue, he worked at Kai Capital Management as a fundamental equity research analyst. Nate received a B.S/B.A. in Finance and International Business from Georgetown University’s McDonough School of Business (2020).