Brian Christiansen

With more than two decades of experience, Brian Christiansen is recognized as one the country’s foremost financial services lawyers. He counsels U.S. and international banking organizations, nonbank financial services firms and their investors and counterparties on all types of regulatory, transactional, compliance and enforcement matters. Brian often handles multifaceted and novel matters in the financial services industry. He has helped clients structure and execute acquisitions, investments and corporate transactions, obtain charters, raise capital, develop new products, implement compliance programs, conduct internal investigations and resolve enforcement actions. Brian also routinely represents clients before the OCC, FDIC, Federal Reserve and state banking departments.

Joined Simpson Thacher as a Partner in 2024, having previously been a Partner at another major U.S. law firm since 2010.

Chairman, Mergers and Acquisitions Subcommittee, Banking Law Committee, American Bar Association (2011-2015).