Leo J. PortmanLeo J. Portman

Leo J. Portman, an Oklahoma City attorney, brings over thirty years of experience to GableGotwals in the area of oil and gas law including title examination. He also practices in the areas of Business Structuring, estate planning, and corporate and securities law.

Prior to joining GableGotwals, Leo was a Sole Practitioner at Portman & Associates. He has previously served as President of an oil and gas company during bankruptcy liquidation and payment of creditors, all of whom were paid in full under his direction. He also fulfilled the role of Manager at an oil and gas exploration company and has outlined estate plans for clients.

Leo has been active in various civic organizations in Oklahoma, serving currently as President of Downtown Kiwanis of Oklahoma City, President of Oklahoma City Real Property Lawyers Association, as a member of the Board of Directors for First National Bank of Oklahoma and the Last Frontier Council Executive Board of Directors, and previously as a member of the Board of Directors and president of the Oklahoma City Golf and Country Club, Baden Powell Boy Scout District of Last Frontier Council, Volunteer Center—United Way Agency, and as a Board of Trustees Member for World Neighbors.

He also served as a member of the Board of Directors for Charter National Bank and the Board of Directors for the YMCA at both the Northside and Metropolitan locations, holding leadership roles of President, Vice President and Treasurer during his tenure. Leo is a member of Leadership Oklahoma City Class XV.

Leo is a member in good standing of the Oklahoma Bar Association and admitted to practice before all Oklahoma District Courts.


J.D., University of Oklahoma, School of Law, Norman, Oklahoma, 1980

Bachelor of Business Administration / Accounting & Finance, Southern Methodist University, Dallas, Texas, 1978


Best Lawyers
Lawyer of the Year – Oklahoma City
Corporate Law – 2019

Energy Law
Corporate Law


Oklahoma Bar Association
Oklahoma City Mineral Lawyers Society
Robert J. Turner American Inn of Court