John J. “Jay” Griffin III

John J. “Jay” Griffin III is a partner at Hartzog Conger Cason. He focuses his practice on corporate law, mergers and acquisitions, private securities offerings, tax controversies, and complex real estate and finance transactions. He advises a wide range of clients on sophisticated business matters and commercial strategy.

John earned his Bachelor of Arts in Finance from the University of Oklahoma in 2002, graduating summa cum laude. He then received his Juris Doctor from the University of Oklahoma College of Law in 2005, graduating with honors. He was named a Pierrepont Scholar and earned five American Jurisprudence awards.

A seasoned corporate attorney, John has been consistently recognized by Best Lawyers in America in multiple categories, including Corporate Law, Mergers & Acquisitions, Closely Held Companies, and Commercial Transactions. In 2025, he was named Lawyer of the Year for Commercial Transactions/UCC Law.

John provides legal guidance to closely held companies, partnerships, and family businesses. His expertise spans governance, private placements, tax disputes, and transactional structuring. He is frequently sought after for his pragmatic, results-driven counsel in high-value business deals.

John is admitted to the Oklahoma Bar and actively involved in the American Bar Association and the Oklahoma Bar Association’s Business and Real Property Law sections. His contributions reflect his deep understanding of commercial law and regulatory frameworks.

Beyond his professional achievements, John J. “Jay” Griffin III is a graduate of Leadership Oklahoma City’s LOYAL program (Class VI) and remains engaged in civic life as a member of Nichols Hills United Methodist Church. He is also an Eagle Scout, underscoring a lifelong commitment to leadership, service, and excellence in both personal and professional arenas.

Law Office Affiliations

• Partner, Hartzog Conger Cason
• Member, Oklahoma Bar Association, Business and Corporate Law, Real Property Law
• Member, American Bar Association

Licensed State

• Oklahoma

Education

• University of Oklahoma, College of Law
  Juris Doctor (JD)
• University of Oklahoma
  Bachelor of Arts (BA)

Awards & Badges