Jennie M. Mook


(405) 270-6087
Oklahoma City

Jennie Mook is a trial and appellate lawyer whose practice encompasses a range of business and corporate litigation, including contract disputes, complex business litigation, class actions, antitrust, unfair competition, and trade regulations disputes before state and federal trial and appellate courts, administrative proceedings and hearings, and arbitrations. As part of her banking litigation practice, she not only defends financial institutions against claims and class actions brought by consumers, but she also provides counsel and advice to banks, savings associations, and other financial institutions on federal regulations regarding overdraft fees, insufficient fund fees, and multiple representment of fees. Jennie’s litigation experience has also focused heavily on successfully obtaining and defeating injunctive relief in the form of temporary restraining orders and temporary and preliminary Injunctions. She has gained unique experience in anti-SLAPP litigation (strategic lawsuits against public participation), successfully obtaining dismissals under Oklahoma’s Citizen Participation Act.

A portion of Jennie’s practice is also devoted to labor and employment issues as well as oil and gas disputes. Specifically, Jennie has experience representing management exclusively in all aspects of dispute resolution arising from the employer-employee relationship, including controversies arising under the Fair Labor Standards Act and claims of discrimination, harassment, retaliation, wrongful termination. She also draws on her background in natural resources and environmental science to advise clients on a broad range of transactional and litigation matters in oil and gas law, renewable energy, and environmental compliance.

Jennie’s achievements have earned her inclusion in The Best Lawyers in America: Ones to Watch (commercial litigation; labor and employment litigation).

During her undergraduate studies at the University of Oklahoma, Jennie earned three bachelors’ degrees in four years in zoology, environmental studies, and psychology. She went on to work in the fields of wildlife biology and environmental science for years, moving around the country to work with organizations such as the National Park Service and the U.S. Department of Forestry. 

Jennie graduated with highest honors from the University of Oklahoma College of Law in 2021. While pursuing her Juris Doctor, she served as an articles editor for the Oklahoma Law Review and as a judicial extern for the Honorable Robert E. Bacharach of the U.S. Court of Appeals for the Tenth Circuit, was named to the Order of the Coif and National Order of Scribes, and received six American Jurisprudence Awards. Jennie was also a recipient of numerous scholarships and honors, including the Comfort Scholarship, the Oklahoma Bar Foundation Fellowship, and the Holloway Scholarship recognizing academic excellence and leadership. Prior to graduating, she held leadership positions in numerous student organizations, including the student chapter of the Federal Bar Association, the Environmental Law Student Association, and the Organization for Women in the Law.

Representative Experience

  • Successfully defended a municipality by obtaining complete dismissal of all of plaintiff’s claims under the dismissal procedure of the Oklahoma’s Citizen Participation Act, an anti-SLAPP law designed to protect defendants from meritless lawsuits.
  • Currently representing multiple Oklahoma-based and regional banks and credit unions in defending against statewide putative class actions in both Oklahoma and Texas. Allegations include that account holders were assessed fees when the transactions were authorized on a positive balance and settled on a negative balance, that multiple fees were charged on single items (representment of fees), that certain fees were charged which were not authorized by the account agreement, and that fees were assessed on transactions which occurred when positive account balances existed.
  • Successfully defended a professional services firm against a lawsuit seeking $7.2 million where plaintiffs alleged malpractice for failing to protect their interests in resolving a tax dispute with the IRS.
  • Obtained complete summary judgment on behalf of a national temporary staffing agency in a lawsuit alleging seven causes of action, including negligent hiring and supervision, vicarious liability, and breach of contract, and seeking more than $10 million in damages.
  • Upon filing of a motion to compel arbitration, obtained voluntary dismissal of statewide putative class action claims filed in Oklahoma against regional bank. Plaintiffs alleged checking accountholders were charged multiple overdraft and/or insufficient fund fees on a single item and were assessed authorized positive, settle negative fees (“APSN fees”) in violation of the account agreements and brought claims of breach of contract.
  • Defeated request for temporary injunction against a municipality and persuaded the court to not only dissolve the temporary restraining order (entered prior to Ms. Mook being retained), but also successfully recovered the full attorneys’ fees and costs incurred on behalf of the municipal client.
  • Successfully represented a national company in the opposing party’s appeal of a summary judgment ruling granted in favor of the company on seven claims, resulting in the Alabama Supreme Court affirming the ruling in all respects.
  • Successfully opposed a Petition for Original Jurisdiction and Petition for Writ of Prohibition to the Oklahoma Supreme Court on behalf of a municipal client resulting in the Oklahoma Supreme Court denying the opposing party’s requests for relief.
  • Obtained favorable results for clients in matters adverse to administrative agencies, including the Oklahoma Alcoholic Beverage Laws Enforcement (ABLE) Commission, the Oklahoma State Board of Veterinary Medical Examiners, and the Oklahoma Abstractors Board.

Honors and Awards

  • Selected by peers for inclusion inThe Best Lawyers in America: Ones to Watch (commercial litigation; labor and employment litigation)

Professional Organizations and Memberships

  • Oklahoma County Bar Association
  • Oklahoma Bar Association
  • Federal Bar Association
  • FBA Mentorship Program, Mentor
  • Oklahoma City Young Professionals
  • Luther Bohanon American Inn of Court

Civic Involvement and Leadership

  • Skyline Urban Ministry (Board of Directors)
  • RSVP Central Oklahoma (Board of Directors)
  • Bella Foundation
  • Regional Food Bank of Oklahoma
  • United Way of Central Oklahoma (Board Serve Class VII)
  • Oklahoma, 2021
  • U.S. District Courts for the Western and Northern Districts of Oklahoma
  • U.S. Court of Appeals for the Tenth Circuit
  • J.D., with highest honors, University of Oklahoma, 2021
    • Articles Editor, Oklahoma Law Review; Order of the Coif; National Order of Scribes; Phi Delta Phi; Comfort Scholar; Holloway Scholar; Recipient, Oklahoma Bar Foundation Fellowship; Student Ambassador; Pro Bono & Public Service Award; 6 American Jurisprudence Awards
  • B.S. (Zoology), University of Oklahoma, 2012
  • B.A. (Environmental Studies), University of Oklahoma, 2012
  • B.A. (Psychology), University of Oklahoma, 2012