"[2] Hall Estill is currently headquartered in Santa Fe Square at 521 East 2nd Street, Suite 1200 in downtown Tulsa.
The Oklahoma City office is located in BancFirst Tower In 1966, Harvard Law School graduate Walter Hall founded the firm now known as Hall Estill in response to a request for outside counsel made by the Tulsa-based Williams Companies (today a Fortune 500 energy company).
[5] In 2010, Hall Estill attorneys successfully defended noted author John Grisham in claims arising from his book The Innocent Man: Murder and Injustice in a Small Town, later turned into a Netflix documentary series.
[7] In 2017, political scientist Adam Feldman identified Hall Estill as one of the four law firms that had appeared most frequently in front of recently-appointed U.S. Supreme Justice Neil Gorsuch during his time on the United States Court of Appeals for the Tenth Circuit.
[12] In 2018, Tulsa corporate and litigation law firm Newton, O'Connor, Turner & Ketchum merged with the larger Hall Estill.