The United Production Partners (UPP) leadership team is comprised of operational, financial and technical experts from the top North American oil & gas operator, EnerVest Operating, L.L.C., and the esteemed energy-focused private equity firm First Reserve.

Board of Directors

Jud Walker is President of EnerVest, Ltd. Prior to this role, Jud was President and Chief Executive Officer of EnerVest Operating, L.L.C (EVOC). He also has served as EVOC Executive Vice President and Chief Operating Officer, leader of the company’s Permian Basin asset team and was head of New Ventures. Before joining EnerVest in 2009, Jud was the lead geoscientist at Chesapeake. He is a founding member of the Next Generation Giving Circle, associated with the Greater Houston Community Foundation. Jud holds a Bachelor of Science in Geology, cum laude, from Texas Christian University and a Master of Science in Geological Sciences, summa cum laude, from The University of Texas at Austin.

Alex Zazzi is President and Chief Executive Officer of EnerVest Operating, L.L.C. Prior to this position, Alex served as Executive Vice President and Chief Operating Officer. Proceeding his role as EVP and COO, he managed the company’s North Texas and Mid-Continent assets. He began his career with Schlumberger, specializing in offshore completions. Originally from Canada, Alex attended the University of Montana and earned a Petroleum Engineering degree from Montana Tech in 2003.

Nicholas Bobrowski is Executive Vice President and Chief Financial Officer of EnerVest, Ltd. Prior to this position, Nick was the Chief Financial Officer of EV Energy Partners, L.P. and Harvest Oil & Gas Corp. Before that he was an energy investment banker with Citigroup Global Markets, where he rose to the level of Vice President. Preceding Nick’s banking career, he rose to the rank of Captain in the 25th Infantry Division of the United States Army after graduating with a Bachelor of Science in Economics from the United States Military Academy at West Point. Nick also holds an M.B.A from the Sloan School of Management at MIT.

Jim is Executive Vice President and Chief Operating Officer of EnerVest Operating, L.L.C. He has served in many roles at EnerVest over the past nine years including Senior Vice President & General Manager of EVOC’s Appalachia South Asset Team, Vice President and General Manager of EVOC’s East Appalachia Asset Team, and Vice President of EVOC Shared Services. Before joining EnerVest, Jim worked as Vice President and Regional Manager for Penn Virginia Corporation and in many roles for Royal Dutch Shell. Jim currently serves as a member of the Board of Directors for the Virginia Oil & Gas Association, as a member of the Board of Directors of TruPoint Bank, as a member of the Advisory Board for the West Virginia University Energy Land Management program, and as an Advisory Board member for the Virginia Tech University Virginia Center for Coal and Energy Research. Jim earned his B.S. degree from the University of Tennessee and his M.B.A. from Houston Baptist University.

Neil Wizel is a Managing Director at First Reserve. First Reserve is a leading global private equity investment firm exclusively focused on energy. Prior to joining First Reserve in 2007, he was a member of the Investment Staff at Greenbriar Equity Group. Prior to Greenbriar, he was a Financial Analyst in the Leveraged Finance/Financial Sponsor Group at Credit Suisse First Boston. Mr. Wizel holds a B.A. from Emory University.

Brooks Shughart is a Managing Director at First Reserve. First Reserve is a leading global private equity investment firm exclusively focused on energy. Prior to joining First Reserve in 2012, he was a Director in the Mergers and Acquisitions Group for Credit Suisse. Prior to Credit Suisse, he held positions in the energy groups of Lazard Freres and Donaldson, Lufkin & Jenrette/Credit Suisse First Boston. Mr. Shughart holds a B.B.A. from The University of Texas.

Juan Diego Vargas is a Director at First Reserve. First Reserve is a leading global private equity investment firm exclusively focused on energy. Prior to joining First Reserve in 2007, he was an Analyst in the Financial Sponsors and Latin America Groups at Morgan Stanley. Mr. Vargas holds a B.B.A. from the University of Notre Dame and an M.B.A. from London Business School.

Steve Mueller has served as a First Reserve Senior Advisor since 2016. Prior to this, he spent 8 years with Southwestern Energy in various management roles including Chairman of the Board, President and CEO, and President and COO. Prior to holding these positions, Mr. Mueller served as Executive Vice President of CDX Gas after spending 6 years with Houston Exploration Company where he held various senior positions. In addition, Mr. Mueller has 26 years of further industry experience with Belco Oil and Gas Corporation, American Exploration, Fina Oil and Tenneco Oil. Mr. Mueller is a member of the Board of Directors of the Gas Technology Institute (GTI) and holds a B.S. from the Colorado School of Mines. Mr. Mueller also currently sits on the Board of Directors for C&J Energy Services (NYSE: CJ).