Mark Sigmon

About Mark | Partner & Chair, Appellate

After graduating first in his class from Duke Law School and clerking for two years on the United States Court of Appeals for 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. That belief continues to guide his practice today.

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, the record, and the story have to come together with precision.

Mark believes that every case, at its core, is a story. The challenge is not just knowing the law or mastering the facts, but distilling both into something a judge or jury can clearly understand. That perspective shapes how he approaches briefing, how he organizes a record, and how he prepares for argument.

He is certified by the North Carolina State Bar as a specialist in appellate practice and is admitted to practice before the United States Supreme Court and numerous federal appellate and district courts across the country. He has been recognized as a Super Lawyer and one of the Top 100 Lawyers in North Carolina, holds an AV Preeminent rating from Martindale-Hubbell, and has been named to Business North Carolina’s Legal Elite. Mark also serves on the Fourth Circuit’s Criminal Justice Act Panel.

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 and $2 million on appeal, and secured reversals in cases involving complex interstate privilege disputes and commission 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.