Mark Sigmon

About Mark | Partner & Chair, Appellate

After graduating first in his class from Duke Law and clerking for two years on the Fifth Circuit, Mark began his career in business litigation, building a foundation in how complex cases are developed and defended. Over time, he made a deliberate shift toward plaintiffs’ work. It was a choice shaped by a simple conviction: individuals and employees deserve the same caliber of legal representation that well-resourced corporate defendants expect as a matter of course.

Today, as a Partner at Lee Segui, Mark focuses on appellate advocacy, class actions, employment, civil rights, and consumer protection litigation. His work often centers on briefing and arguing dispositive motions, class certification issues, and appeals—moments in a case where the law and the record have to come together as part of a cohesive story. And Mark believes that every case has, at its core, a simple story. His goal is to understand the law and the facts so thoroughly that he can distill down that story and then tell it in a way that anyone can quickly and easily understand.

Mark is certified by the North Carolina State Bar as a specialist in appellate practice. He also serves on the Fourth Circuit’s Criminal Justice Act Panel, through which he handles appeals for indigent criminal defendants.

In recent years, Mark has successfully defended class certification on appeal in the face of novel arguments under Supreme Court precedent, defended jury verdicts valued at more than $10 million on appeal, and secured reversals in cases involving complex interstate privilege disputes and employee commissions practices affecting software sales professionals. His appellate work has shaped the trajectory of numerous employment, consumer, and class action matters.

Mark’s undergraduate degree is from the University of North Carolina at Chapel Hill, where he double-majored in physics and medieval history—so it should be obvious which basketball team he supports. He lives in downtown Raleigh with his wife, Jen, and their three children, Fred, Imogene, and Augustus. Mark is an avid vegetable gardener, with a special love for tomatoes, and he is currently getting his eldest child into scuba diving.