Jeff Sieler is a co-head of A&D in the Global Energy Group of Citigroup Investment Bank headquartered in Houston, Texas. Sieler joined the group as a founding member. Sieler's industry experience and technical experience prior to banking spans over 30 years with companies such as: Shell Oil Co., Marathon Oil Co., and Kinder Morgan CO2. He was the leader of Marathon's Reservoir Performance team and Champion of its Eagle Ford Integrated Project Team prior to joining Citi. Sieler's 28 years with Shell culminated at the vice president level as manager of the subsurface and well technologies team, and as a member of Shell Royal Dutch’s Research and Development council. He graduated from Tulane University with an M.S. degree in petroleum engineering and a B.S. degree in chemical engineering from the University of North Dakota.