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Management Team
Mark Bering, President
Mark Bering has over 30 years of experience in the natural gas business, two years of which were previously with Millennium as Vice President of Business Development. During that time Mark was commercially responsible for the Eastern System Upgrade and Valley Lateral projects. Before returning to Millennium in 2020, Mark’s role at DT Midstream (DTM) has included various commercial responsibilities including the pipeline business, the gathering business and growing the storage business at both Washington 10 and DTM.
Prior to joining DT Midstream, Mark worked for 15 years at Union Gas in a variety of management and business development roles. Mark received his BS degree in computer science from the University of Windsor.
Jay White, Senior Vice President, Special Projects for Millennium
Jay has nearly 25 years of experience across regulated U.S. and Canadian natural gas infrastructure. As Senior Vice President, Special Projects for Millennium, Jay responsibilities include supporting strategic growth initiatives across Millennium’s footprint, evaluating and advancing commercial opportunities, and fostering strong, trusted relationships with customers and partners.
Prior to joining Millennium in April 2026, Jay built more than 20 years of experience in the natural gas industry at TC Energy, holding senior leadership roles across Marketing, Commercial, Business Development, Regulatory, and Strategy functions. Most recently, Jay served as Vice President, Regulated Commercial and Business Development, Canada Gas, with responsibility for the commercial performance of TC Energy’s Canadian natural gas pipeline systems. Jay holds a Bachelor of Science degree in Meteorology and a Master of Business Administration, Finance from the University of Oklahoma.
Erich Voeffray, Vice President, Finance
Erich Voeffray has 20 years of energy industry experience serving in progressive management and executive capacities in the areas of finance and general management. As Vice President of Finance, Erich is responsible for the overall financial, regulatory, IT, and human resource activities of the Millennium system. Erich previously worked for DT Midstream and DTE Energy as Director of Joint Ventures and Director of Finance. Erich received an MBA from the Ross School of Business at the University of Michigan, along with a BA in Finance from Michigan State University.
Mark Preisner, SENIOR DIRECTOR, COMMERCIAL
Mark has over 12 years of experience in the Natural Gas, Natural Gas Liquids, and Crude Oil business. As Senior Director, Commercial for Millennium, Mark is responsible for capacity marketing, daily review of market fundamentals, customer relationships, and business development opportunities.
Prior to Millennium, Mark worked in both regulated and unregulated markets, having marketing roles at Dominion Energy, Berkshire Hathaway Energy, and Diversified Energy. Prior to joining Millennium Pipeline, Mark served as Vice President of NGL/Crude Marketing at Diversified Energy, focused on developing the NGL portfolio, asset integration, and identifying optimization opportunities. Mark has BS degrees in Corporate Finance & Resort Management from Coastal Carolina University.
George Flugrad, Associate General Counsel
George Flugrad is a seasoned energy attorney with over thirteen years of experience counseling natural gas and liquids infrastructure companies on complex regulatory, commercial, and transactional matters. Most recently serving as Senior Attorney at BHE GT&S, he provided full-service counsel for the former Dominion Energy interstate pipelines and Cove Point LNG, LP, advising on FERC, PHMSA, and DOE compliance, Section 7 and Section 3 proceedings, as well as the lead in-house counsel for three Section 4 rate case proceedings, including Eastern Gas' first rate case in nearly a quarter century.
Flugrad earned an undergraduate degree in economics and played football at Wagner College, as well as a law degree from Seton Hall University - School of Law.
Dan Diefenbach, Senior Director, Engineering and Construction.
Dan is responsible for the engineering, construction, system planning, and facility design activities for Millennium. He has 24 years of experience in the energy industry. Prior to Millennium, Dan was responsible for the system planning and facility design activities for BHE GT&S and Dominion Energy, which included Eastern Gas Transmission and Storage (EGTS), Cove Point LNG, Carolina Gas Transmission (CGT), Questar and Overthrust pipelines (now MountainWest). His experience includes business development and design of natural gas gathering, processing, transmission, storage, and liquid natural gas (LNG) projects. In addition, Dan has held engineering and marketing roles in Power Generation and Electric Transmission.
Dan received his Bachelor’s degree in Mechanical Engineering from Virginia Commonwealth University and his Master’s Degree in Business Administration from Averett University.