Karen L. Callahan

Robert has been affiliated with Pray Walker since 1992 and has focused on trials of civil disputes. Robert’s practice began with the defense of personal injury and product liability lawsuits, but has grown to include handling cases involving business fraud and interference, breaches of corporate duties, and problems arising from business agreements. The contractual disputes range from commercial warranty claims to construction problems to oil and gas accounting issues and surface damage...

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...

Jennifer L. De Angelis is a lawyer recognized by Best Lawyers in the practice areas of Medical Malpractice Law - Plaintiffs and Personal Injury Litigation - Plaintiffs. Jennifer L. practices law in Tulsa, Oklahoma Best Lawyers has recognized Jennifer L. De Angelis since 2023. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Jennifer L. De Angelis is held by ...

Kevin Doyle has been with Pray Walker since 1987. He provides consultation concerning compliance with state and federal labor and employment laws. He also represents employers before state and federal courts and administrative agencies including the Equal Employment Opportunity Commission, U.S. Department of Labor (Wage and Hour Division), National Labor Relations Board, and State Labor and Human Rights Commissions.Kevin has considerable experience in providing anti-harassment training and ma...

William H. Spitler is a trial lawyer who has tried and litigated cases in several areas of law, including construction, labor and employment, oil and gas, class action defense, sales and leasing disputes, antitrust defense, commercial contract disputes, fraud and breach of fiduciary duty. Mr. Spitler’s diverse and active litigation practice has provided him the opportunity to present cases before numerous state and federal court judges and appeal panels across the county. Mr. Spitler&rs...

Maren Minnaert Lively is a lawyer recognized by Best Lawyers in the practice area of Family Law. Maren Minnaert practices law in Tulsa, Oklahoma Best Lawyers has recognized Maren Minnaert Lively since 2024. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Maren Minnaert Lively is held by other lawyers.

Mbilike Mwafulirwa is a lawyer recognized by Best Lawyers in the practice areas of Appellate Practice, Civil Rights Law and Personal Injury Litigation - Plaintiffs. Mbilike practices law in Tulsa, Oklahoma Best Lawyers has recognized Mbilike Mwafulirwa since 2025. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Mbilike Mwafulirwa is held by other lawyers.

Dan S. Folluo is a lawyer recognized by Best Lawyers in the practice areas of Insurance Law and Personal Injury Litigation - Defendants. Dan S. practices law in Tulsa, Oklahoma Best Lawyers has recognized Dan S. Folluo since 2017. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Dan S. Folluo is held by other lawyers.

Having developed a successful high school speech and debate program, Randall Vaughan left education to pursue a career as a trial lawyer, a goal that guided his law school education and decision to join Pray Walker in 1985. Randall has tried numerous cases in federal and state courts, and written legal briefs and presented oral arguments at the appellate level. He has also served as an advocate for clients in private arbitrations. As a counselor, he assists large companies in managing their n...

Amy Newsome is a member at DORWART whose practice focuses on estate planning, estate and trust law, investment management, securities law, banking and finance, fiduciary matters, and regulatory compliance. She advises individuals, families, banks, trust companies, investment advisers, broker-dealers, and nonprofit organizations on estate planning, wealth transfer strategies, fiduciary structures, governance, and complex regulatory requirements. Amy also serves as trusted counsel to financial ...