Litigation

Joined the Firm in 2016; became Partner in 2023. Former Law Clerk, Hon. Reggie B. Walton, United States District Judge for the District of Columbia. Former Honors Attorney, Office of the General Counsel of the U.S. Department of Homeland Security.

A Partner in Simpson Thacher’s National Security Regulatory Practice, Mark advises on significant cross-border transactions undergoing national security reviews before the Committee on Foreign Investment in the United States (CFIUS) and coordinates analogous foreign direct investment (FDI) approvals globally. He advises some of the world’s most well-known private equity firms, multinational corporations, and institutional investors across a variety of industries considered sensitive to national security such as aerospace and defense, semiconductors, telecommunications, sea and airports, energy generation, financial services, technology and social media, and life sciences, among others. Mark has significant experience negotiating commercially acceptable mitigation and responding to non-notified inquiries.

J.D., magna cum laude and Order of the Coif, Case Western Reserve University; and B.Sc., Cornell University