Marshall S. Billingslea, a Senior Adviser for StoneTurn, has nearly 30 years of experience in geopolitical risk, sanctions advisory, counter-illicit finance, CFIUS, investigations, due diligence and M&A. Most recently, Marshall served as Special Presidential Envoy at the U.S. Department of State, and Assistant Secretary for Terrorist Financing and Financial Crimes at the U.S. Treasury Department.

As the special presidential envoy for arms control at the U.S. Department of State, Marshall held the personal rank of ambassador. He led arms control negotiations and worked with partners and allies in Europe and Asia on the development and deployment of defensive capabilities. Prior to this, Marshall served as the assistant secretary for terrorist financing at the U.S. Department of the Treasury, where he built international coalitions and led U.S. efforts to counter illicit financial activities around the globe. In 2018, he was selected as president of the Financial Action Task Force (FATF)—the global anti-money laundering and counter-terrorist financing body—and co-chaired the global Counter-ISIS Finance Group and multiple bilateral negotiations with friendly and allied nations.

Before rejoining the U.S. government in 2017, Marshall spent more than eight years in the private sector as a Managing Director at a Big Four firm. He previously served in several senior roles within the Department of Defense and at NATO, including as deputy undersecretary of the Navy and assistant secretary general for defense investment at NATO. Earlier in his career, he served for more than six years as the senior professional staff member for national security affairs on the Senate Foreign Relations Committee.

Marshall holds a BA from Dartmouth College and an MA in law and diplomacy from Tufts University. He has been awarded the Defense Medal for Distinguished Public Service by the U.S. Secretary of Defense and decorated by the U.S. secretary of the navy with the Distinguished Public Service medal, and received the Treasury Medal in recognition of his work at the Department of the Treasury