Monica A. Dionisio

Since 2006, I have served as an advisor and legal counsel to individuals and families across a wide geographic region, including communities from Dallas to St. Louis. My practice focuses on Family Law matters, including divorce and child custody disputes that directly affect family relationships, financial stability, and long-term planning. I also represent clients in complex guardianship cases, particularly those involving multi-state or international considerations. Practicing law has been ...

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...

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...

Danya Bundy represents individuals in prenuptial agreement negotiations and in family law disputes involving child custody, alimony, child support, and domestic violence claims. Fluent in Arabic and German, she advises on international matters, including Hague treaty child abduction claims. Danya is one of few attorneys in private practice with extensive first-chair jury trial experience defending parents in parental rights cases, as she has tried six such jury trials to verdict. Her deep bac...

Michael J. Heron is a Partner in our Oklahoma City office with over 30 years of legal experience. He specializes in protecting the rights of individuals and businesses in civil cases involving medical malpractice, professional liability, construction, transportation, and insurance matters. Mike represents hospitals, practice groups, physicians, nurses, and other health care professionals in a wide range of litigation, policies and procedures, compliance, investigations, business transactions,...

Len Cason is a lawyer recognized by Best Lawyers in the practice areas of Corporate Law, Tax Law and Trusts and Estates. Len practices law in Oklahoma City, Oklahoma Best Lawyers has recognized Len Cason since 1993. 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 Len Cason is held by other lawyers.

J. Leslie LaReau is a lawyer recognized by Best Lawyers in the practice areas of Tax Law and Trusts and Estates. J. Leslie practices law in Oklahoma City, Oklahoma Best Lawyers has recognized J. Leslie LaReau since 2012. 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 J. Leslie LaReau is held by other lawyers.

Amy J. Sine is a lawyer recognized by Best Lawyers in the practice areas of Litigation - Trusts and Estates, Nonprofit / Charities Law and Trusts and Estates. Amy J. practices law in Oklahoma City, Oklahoma Best Lawyers has recognized Amy J. Sine since 2003. 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 Amy J. Sine is held by other lawyers.

John J. Griffin III is a lawyer recognized by Best Lawyers in the practice areas 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. practices law in Oklahoma City, Oklahoma Best Lawyers has recognized John J. Griffin III since 2016. The Best Lawyers recognition is based on a peer-review survey of lawye...

Jessica Hatcher is a lawyer recognized by Best Lawyers in the practice areas of Energy Law and Oil and Gas Law. Jessica practices law in Oklahoma City, Oklahoma Best Lawyers has recognized Jessica Hatcher 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 Jessica Hatcher is held by other lawyers.