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Leonhard Birnbaum is a German businessperson who has been at the helm of 11 different companies is Chief Operating Officer-Integration at E.ON SE, Member-Management Board at RWE Energy AG and Vice President at Union of Electricity Industry and on the board of 5 other companies. He previously was Chief Commercial Officer & Member-Executive Board at RWE AG and Chairman-Supervisory Board of RWE Supply & Trading GmbH (a subsidiary of RWE AG), Member-Supervisory Board at Wintershall Dea International GmbH, Chairman-Supervisory Board of E.ON Sverige AB, Chairman-Supervisory Board for E.ON Hungária Zrt., Chairman at E.ON Ceská republika sro, Chairman-Supervisory Board of E.ON Czech Holding AG, Chairman at E.ON Distribuce as, Chairman-Supervisory Board for E.ON Global Commodities SE, Chairman for Uniper Technologies GmbH and Senior Partner at Mckinsey & Co., Inc. (Germany). Leonhard Birnbaum received a doctorate from Brandenburg University of Technology Cottbus and an undergraduate degree from the University of Karlsruhe.

David Birnbaum is the founder of Junction Venture Partners (2022) and Five Four Ventures LLC (2018) where he holds the title of Managing Partner.
He is also the founder of Above Average Productions, Inc., TAKKLE, Inc., Waggle Ventures, Inc., and Sanctuary Ventures, Inc. Mr. Birnbaum's former jobs include Director at Personas Social, Inc. (2014-2015), Advisory Board at Legend Pictures LLC (2011-2012), Groupon, Inc. (2010-2012), and VillageVines, Inc. (2011-2012), President at Broadway Video Ventures LLC (2010-2018), and Senior Advisor at Alloy Digital LLC (2005-2010).
Mr. Birnbaum received his undergraduate degree from The Trustees of Columbia University in The City of New York in 1997 and his MBA from The Wharton School of the University of Pennsylvania in 2005.