Igor Radomyshelsky

Senior Vice President and member of the dedicated Infrastructure Credit team at OIC

Igor Radomyshelsky is Senior Vice President and member of the dedicated Infrastructure Credit team at OIC, a private investment firm founded in 2015 that provides debt, equity and growth-capital solutions to middle-market infrastructure businesses. He has been seconded to Grapevine Energy Holdings, LLC, a vertically integrated renewable fuels company, where he serves as Chief Executive Officer and Board Member following the company’s successful emergence from Chapter 11 restructuring.

Prior to joining OIC, Igor was Vice President at Goldman Sachs in the Investment Banking Division where he spent three years as a member of the Natural Resources Group in London, and two years with the Technology Group in San Francisco. During his time there, Igor provided M&A, financing, and activism defense advisory services to clients in the energy, power and utilities, infrastructure, oil field services, industrial software, and mobility sectors with a focus on the energy transition.

Prior to Goldman Sachs, Igor worked for Royal Dutch Shell where he restructured financial reporting procedures for the US upstream business, managed the construction, commissioning, and startup of the largest refinery in North America, and executed strategic transactions as a member of the corporate M&A team.

Matthew Kondratowicz

Managing Director and member of the dedicated Infrastructure Credit team at OIC

Matt Kondratowicz is Managing Director and member of the dedicated Infrastructure Credit team at OIC, a private investment firm founded in 2015 that provides debt, equity and growth-capital solutions to middle-market infrastructure businesses. He has been seconded to Grapevine Energy Holdings, LLC, a vertically integrated renewable fuels company, where he serves as Chief Strategy Officer and Board Member following the company’s successful emergence from Chapter 11 restructuring.

Prior to joining full-time, Matt served as an advisor to OIC, including assisting in the execution of the Bakersfield Renewable Fuels investment.

Previously, Matt spent 7 years at CSL Capital Management, where he led numerous buyouts, growth equity, corporate carve-outs, and de novo investments in the energy sector. Prior to that he spent two years as Vice President at the Deutsche Bank Masdar Cleantech Fund and two years as Associate at Citi Sustainable Development Investments; in both roles he provided growth equity to renewable energy and sustainable infrastructure companies. Over his career, Mr. Kondratowicz has played a leading role in transactions totaling over $2.0 billion in capital.

Matt started his career as an Assistant Economist at the Federal Reserve Bank of New York focusing on international trade, economic development, and global energy markets

Antonio D’Amico

Executive Vice President, Chief Administrative Officer, & General Counsel

Antonio D’Amico joined Global Clean Energy as a Senior Vice President, Chief Administrative Officer and General Counsel on February 28, 2022. Prior to joining Global Clean Energy, he was Senior Vice President, Deputy General Counsel and Chief Ethics and Compliance Officer at AECOM, and served as Senior Vice President, Legal and Special Projects at AECOM before that. Mr. D’Amico served as Executive Vice President, and Corporate Secretary at Maverick Natural Resources, LLC, and Vice President, Investor Relations and Government Affairs at Breitburn Energy Partners. He was Senior Assistant General Counsel at Occidental Petroleum Corporation from 1996 to 2014, and began his legal career at Skadden Arps. He obtained a J.D. from DePaul University College of Law and a B.S.J. in Journalism from Northwestern University.

Dario Maffei

Chief Executive Officer, Upstream

Dario Maffei joined Grapevine Energy Holdings as Chief Executive Officer, Upstream, in February 2026. He is an international operator and commercial leader with more than two decades of experience building and scaling businesses across the agriculture, energy, and physical commodities sectors.

Prior to joining Grapevine, Dario served as Head of Agro Business at Vibra Energia, a publicly listed distributor of fuels, lubricants, and bioenergy products in Brazil. In this role, he created and scaled a new commercial platform integrating agriculture, fuels, and infrastructure, establishing partnerships, developing supply channels, and building the organization and operating model to support long-term growth.

Previously, he held senior leadership positions at Indigo Ag, an American agricultural technology company. He initially served as Head of Latin America and President of Brazil, where he launched the company’s Brazilian operations and expanded farmer participation across the region. He was later appointed Global Chief Business Officer, overseeing North America, Europe, and Latin America and leading commercialization, market development, and go-to-market execution across regions.

Mr. Maffei began his career at Cargill, where he spent 17 years in the United States and South America in progressively senior trading and commercial leadership roles in physical commodity markets.

He holds a degree in Business Administration from Universidad Nacional de La Plata and executive studies in strategy and business development at the Carlson School of Management, University of Minnesota.