Mark Seyler

During his 26-year FBI career, Mark Seyler led dozens of investigations of violent extremists motivated by a variety of ideologies. He played key roles in cases involving paramilitary leaders and groups in several states. His work also helped obtain convictions of a Pennsylvania man for attempting to aid Al-Qaeda in 2007 and an ISIS-inspired extremist in Montana in 2019. Seyler also handled high-profile white-collar crime investigations, including the Montana case described in the book and a...See more

During his 26-year FBI career, Mark Seyler led dozens of investigations of violent extremists motivated by a variety of ideologies. He played key roles in cases involving paramilitary leaders and groups in several states. His work also helped obtain convictions of a Pennsylvania man for attempting to aid Al-Qaeda in 2007 and an ISIS-inspired extremist in Montana in 2019. Seyler also handled high-profile white-collar crime investigations, including the Montana case described in the book and a groundbreaking corruption case involving the Oklahoma Health Department in the early 2000s. As a subject matter expert, Seyler continues to train law enforcement regarding domestic violent extremism, the First Amendment, and related topics. He emphasizes upholding constitutional rights and civil liberties while enforcing laws fairly, regardless of politics or ideology. He is a sixth-generation Montanan who enjoys outdoor recreation under the Big Sky. See less