William (Bill) Marko

William (Bill) Marko joined Jefferies as a Managing Director in the Energy Investment Banking group in Houston in February 2005.  In 2023 he became a Special Advisor in the group. He has managed more than $80 billion in upstream oil and gas asset and corporate transactions, has worked face to face with clients in more than 25 countries, and he has evaluated oil and gas opportunities in more than 100 countries.  He has also completed transactions in every major oil and gas basin in the U.S. and Canada. 

Prior to joining Jefferies, Bill worked for Mobil Oil in various engineering and commercial roles for 18 years followed by seven years at two boutique A&D advisory firms. Bill received his BS (1981) and MS degrees (1983) from Tulane University, and he is currently a member of its Board of Trustees.