About Katherine Marie
Katherine Marie Liebner’s path to the law began in Western New York. She earned her undergraduate degree from Canisius College in 2003 and returned to the region for law school, receiving her J.D. from SUNY Buffalo Law School in 2010. The chronology is simple but telling: classroom years in Buffalo bookend a steady move into the practice of law.
She joined Gross Shuman P.C. in 2011. Early in her career she took on the routine demands of a litigation practice and the sudden urgencies that come with deadlines and filings. Colleagues remember her as someone who learned the ropes quickly and who adapted to the hybrid rhythm of court calendars and client meetings. The record shows steady professional presence rather than headline-grabbing cases.
Liebner is admitted to practice in New York and Florida, and she is admitted to the U.S. District Court for the Western District of New York. That mix of state and federal admissions allows her to appear in a range of forums. She has handled matters that required navigation of both state procedures and federal rules, giving her the ability to move between court systems when a case demands it.
Her practice at Gross Shuman P.C. has involved the day-to-day work that keeps a law firm running: drafting pleadings, managing discovery, preparing clients for hearings. She has also spent time in depositions and hearings in state and federal court. Those tasks do not often make news, but they form the backbone of litigation practice. Her work is procedural and client-centered, aimed at advancing a matter through the stages of litigation or resolving disputes before they escalate.
Outside the courtroom, Liebner has remained tied to the legal communities in which she trained and practices. She keeps professional ties in both New York and Florida and has continued to practice across those states. Her career arc reflects steady development rather than dramatic shifts — an accumulation of experience that translates into practical knowing of how cases move through the system.
As of 2026 she continues at Gross Shuman P.C., practicing in the jurisdictions where she is admitted and handling matters in state and federal court as they arise.
