Simpson Thacher & Bartlett LLP ‘s National Security Regulatory Practice is led by Washington DC-based Abram Ellis and Malcolm Tuesley, with George Wang serving as co-head of the International Trade Regulation Practice and Asia Litigation Practice out of the New York office. Tuesley is widely recognized for his expertise in CFIUS, FOCI mitigation, export controls, and national security agreements across the defense, technology, telecommunications, and energy sectors. Ellis advises global private equity and financial institutions on sanctions, anti-money laundering, and financial crime compliance in high-stakes cross-border acquisitions. Wang brings deep experience in OFAC, export controls, and international trade law, guiding clients through complex regulatory and internal investigations. Mark Skerry, in Washington DC, secures CFIUS and facility security clearance approvals, ensuring mitigation measures are commercially effective.
Legal 500 Editorial commentary
Accolades
Client satisfaction: Sector knowledge
Testimonials
Collated independently by Legal 500 research team.
- ‘The team is one of the best in Washington DC for handling national security and sanction matters. They have especially assisted us on complex and very sensitive matters for our main clients.'
- 'We were impressed by the technical expertise of the members of the team, the clarity of their explanations and their deep knowledge and understanding of the DC and US national security context. Their availability is always at top.'
‘Mick Tuesley is a very well-known and good practitioner, fully available to jump in the most complex cases.'
'Mark Skerry is excellent at carrying out complex assignments and has very good commercial skills. Jennifer Ho and Claire Di Mario, recently promoted partners, are also exceptional from a technical and operational point of view. The rest of the team is outstanding.'
Key clients
- Antin Infrastructure Partners
- Baring Private Equity Asia
- Blackstone Inc.
- CBRE Group, Inc.
- Cisco Systems, Inc.
- Corsair Capital
- EQT AB
- Global Infrastructure Partners
- Goldman Sachs Group, Inc.
- Hellman & Friedman LLC
- IFM Investors
- KKR & Co. Inc.
Practice head
Abram Ellis; Malcolm Tuesley; George Wang
Other key lawyers
Mark Skerry; Jennifer Ho; Claire Di Mario