Management Team

Marshall Lang

Marshall Lang


Marshall Lang was named President of Sequent Energy Management in October 2016. In this role, he leads all aspects of Sequent’s operations, including natural gas marketing, asset management, generation services, producer services and energy logistics. Lang brings more than 35 years of diversified experience including both regulated and non-regulated areas of the energy industry. During his career, Lang has held a number of start-up and key leadership positions.

Bob Hayes

Robert E. (Bob) Hayes

Chief Operating Officer

Bob Hayes was named Chief Operation Officer in October 2016. This role includes continuing responsibility for overseeing all of Sequent’s trading and operations activities. Hayes has more than 25 years of experience in the natural gas industry.

Marlem Rios

Marlem Rios

Controller – Wholesale Gas and Midstream

Marlem was named Controller in 2018 and is responsible for the accounting and financial reporting, regulatory, budgeting, forecasting, and SEC reporting functions. Rios has more than 18 years of experience in the energy industry.

Mark E. Rueff

Mark E. Rueff

Vice President, Origination

Mark Rueff leads wholesale origination and commercial and industrial business platforms. He brings nearly 20 years of experience in the natural gas industry to his role.

Berney C. Aucoin

Berney C. Aucoin

Vice President, Commercial Operations

Berney Aucoin provides analytical valuation support, strategic direction and oversight of Sequent’s financial NYMEX trading in his role. He has more than 25 years of diversified industry experience including structuring, marketing and business development in the natural gas and power sectors.

Donald Knight

Director, Human Resources

Donald provides strategy and leadership in the development, oversight and administration of HR programs for the commercial businesses within Southern Company Gas.

Kathryn L. McCoy

Associate General Counsel, Pipeline Investments and Commercial Business

Kathryn McCoy brings more than 30 years of energy law industry experience to her legal affairs role associated with pipeline investments and commercial businesses, including Sequent Energy Management.