Simpson Thacher & Bartlett LLP

Simpson Thacher & Bartlett LLP has established itself as a key advisor to clients on matters arising from transactions, including work related to environmental risk, liabilities, compliance, and regulatory and enforcement developments. With expertise in corporate transactions, the group has developed a diverse client roster spanning manufacturing, energy, and technology sectors. Toby Chun sits in the DC office and plays a central role in managing environmental aspects in corporate and real estate transactions for both domestic and international clients. The DC office recently expanded with the hire of Carleigh Rodriguez from Kirkland & Ellis LLP in March 2025. Rodriguez is engaged by private equity and corporate clients across the full spectrum of commercial transactions. In the New York office, Michael Isby brings additional transactional expertise to the practice, having recently acted for Paramount Global in its merger with Skydance Media, LLC. The three jointly head up the practice.