Hall Estill

Terrell Siegfried began his career with Hall Estill where he practiced primarily in the Corporate/Commercial, Tax and Estate Planning areas. In 2012, Terrell began an Of Counsel relationship with the firm when he became senior legal counsel at NORDAM. Today, he serves as Assistant General Counsel and Legal Secretary for the company.



  • University of Notre Dame Law School (J.D., 2007)
  • University of Tulsa (B.B.A. in Management, 2002)


  • Oklahoma (2007)
  • 2007 - Present Hall Estill
  • 2012-Present NORDAM, Assistant General Counsel & Corporate Secretary
  • Recognized as an Oklahoma Rising Star in Business/Corporate by Oklahoma Super Lawyers
  • Named to Oklahoma Magazine's 40 Under 40 list in 2011
  • Named to Tulsa Business Journal's 40 Under 40 list in 2012
  • Recipient of the 2012 Leadership in Law award presented by the Journal Record 
  • Board Member, the NORDAM Group, Inc.
  • Board Member & President, ARSA (Aeronautical Repair Station Association)
  • Board Member, University of Tulsa College of Law, Dean's Advisory Board
  • Board Member, Tulsa Charity Flight Night, Inc.
  • Board Member, St. Philip Neri Newman Center
  • Board Member, Gilcrease Museum National Board
  • Co-Chairman, Gilcrease Museum Collector's Reserve and Rendevous  Committees
  • Committee Member, Cascia Hall Preparatory School Special Committee
  • Committee Member, University of Tulsa Scholarship Endowment Committee
  • Gilcrease Museum, American Art Committee
  • 2010, Cystic Fibrosis Foundation, Tulsa's Top 20 New Leaders
  • 2008, Street School, Outsiders Party
  • University of Tulsa Letterman's Association
  • University of Tulsa President's Council
  • Oklahoma Bar Association
  • Tulsa County Bar Association


© 2024 Hall Estill. All Rights Reserved.