David M. Sullivan

Hard work is part of my DNA. I put myself through law school at night while working full time. I am both an attorney and a business owner with over 30 years experience. I understand that business is not a 9-5 proposition, and that's why my clients know they can reach me whenever they need me.

Roberto L. Seda is a top attorney recognized by Best Lawyers in the practice area(s) of Energy Law. Roberto L., who practices law in Oklahoma City, Oklahoma, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Roberto L. is held by other top lawyers in the same geographic and legal practice area.

Jessica Hatcher is a top attorney recognized by Best Lawyers in the practice area(s) of Energy Law and Oil and Gas Law. Jessica, who practices law in Oklahoma City, Oklahoma, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Jessica is held by other top lawyers in the same geographic and legal practice area.

John J. Griffin III is a top attorney recognized by Best Lawyers in the practice area(s) of Business Organizations (including LLCs and Partnerships), Closely Held Companies and Family Businesses Law, Commercial Transactions / UCC Law, Corporate Law, Litigation - Real Estate, Mergers and Acquisitions Law and Real Estate Law. John J., who practices law in Oklahoma City, Oklahoma, has been recognized since 2016. This recognition is based on an exhaustive peer-review survey, reflecting the high e...

Mark E. Bialick entered the practice of law in 1981. His practice centers upon complex civil litigation, and, over the course of his nearly forty-year career, Mark has litigated and tried to verdict several of the State of Oklahoma’s seminal cases in the areas of insurance, particularly with respect to the duty of good faith and fair dealing, as well as cases involving catastrophic injuries and wrongful death. In 2006, Mark was inducted as a fellow in the American College of Trial Lawye...

James (“Jim”) K. Larimore began practicing law in 1974. Jim is an experienced and highly regarded corporate and real estate lawyer whose practice consists of assisting clients in a variety of business matters, including corporate and real estate transactions as well as complex commercial litigation. His practice also includes extensive work in the areas of probate and trust litigation. Jim’s achievements have earned him inclusion on The Best Lawyers in America list of &ldquo...

Amy brings more than 25 years of experience in trial and appellate practice, with a career shaped by leadership roles and in-depth involvement in Family Law matters. Her background includes serving with Oklahoma Child Support Services, where she helped lead the state’s implementation of the Uniform Parentage Act, as well as her service as a District Judge for the Cherokee Nation. This range of experience provides her with a well-rounded understanding of family law issues affecting indiv...

Thomas J. Daniel IV is a top attorney recognized by Best Lawyers in the practice area(s) of Family Law. Thomas J., who practices law in Oklahoma City, Oklahoma, has been recognized since 2010. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Thomas J. is held by other top lawyers in the same geographic and legal practice area.

Stacey D. Spivey's practice focuses on estate planning and trust and estate administration and litigation. Ms. Spivey works with individuals to prepare and implement their estate plans to meet family, tax and other goals, including business succession planning. She also works with individuals and fiduciaries on the management and settlement of trusts and estates, including probate administration, preparation of federal estate and gift tax returns, and estate and trust litigation matters. Ms. ...

Kurt Rupert is a top attorney recognized by Best Lawyers in the practice area(s) of Antitrust Law and Commercial Litigation. Kurt, who practices law in Oklahoma City, Oklahoma, has been recognized since 2016. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Kurt is held by other top lawyers in the same geographic and legal practice area.