Tammie Beassie Banko is an associate whose practice focuses on complex commercial and securities litigation, including work on federal court litigation and trial teams, with additional experience in white collar defense and government investigations. She represents clients in high-stakes disputes across all phases of litigation, including pre-trial proceedings, dispositive motion practice, and trial.
Prior to joining Gibson Dunn, Tammie served as a judicial law clerk to the Honorable Kurt D. Engelhardt of the United States Court of Appeals for the Fifth Circuit. She previously clerked for the Honorable Sidney A. Fitzwater of the United States District Court for the Northern District of Texas.
Before her appellate clerkship, Tammie was an associate at an international law firm, where she maintained a broad litigation practice encompassing complex commercial disputes, securities litigation, and white collar matters. She has litigated trade secret and other complex business disputes with responsibility for drafting through all stages of litigation. Her experience also includes representing clients in parallel DOJ and SEC investigations and other regulatory bodies, advising on litigation risk and strategy. She has secured SEC no-action letters, DOJ declinations, and represented a defendant through trial. She also has experience representing clients in State AG investigations and enforcement actions.
Tammie earned her Juris Doctor, magna cum laude, from SMU Dedman School of Law, where she was elected to the Order of the Coif and served as a Casenote and Comment Editor and Articles Editor of the SMU Law Review. She received her Bachelor of Arts, with high honors, from The University of Texas at Austin, where she studied Plan II Honors and English and minored in Spanish. Tammie began her career as a Teach for America corps member, teaching fifth- and eighth-grade reading and writing in Memphis, Tennessee.
Tammie is admitted to practice in Texas and before the U.S. Court of Appeals for the Fifth Circuit and the U.S. District Courts for the Northern and Eastern Districts of Texas.
Capabilities
Credentials
Education:
- Southern Methodist University - 2019 Juris Doctor
- University of Texas, Austin - 2011 Bachelor of Arts
Admissions:
- Texas Bar
Clerkships:
- US Court of Appeals, 5th Circuit, Hon. Kurt D. Engelhardt, 2024 - 2025
- US Court of Appeals, 5th Circuit, Hon. Catharina Haynes, 2022
- USDC, Northern District of Texas, Hon. Sidney A. Fitzwater, 2019 - 2020