Amy Mahon joined Simpson Thacher & Bartlett as a partner in the firm’s Mergers and Acquisitions Practice in London.

Mahon is a prominent M&A lawyer who specializes in U.K. and cross-border M&A, leverage buyouts, infrastructure and consortium transactions on behalf of financial sponsors including private equity firms, infrastructure funds and investment banks.

“We are very pleased to welcome Amy to our outstanding M&A group in London,” said Bill Dougherty, chairman of Simpson Thacher’s Executive Committee. “Her extensive experience advising private equity firms and investment banks, particularly within the infrastructure space, makes her an excellent addition to our London team and further enhances our ability to tackle the largest and most complex transactions for clients both in Europe and across the globe.”

“Amy is a perfect fit for our London team having already worked on a number of market-leading transactions on behalf of longstanding Simpson Thacher private equity clients,” said Jason Glover, managing partner of the London office. “Her impressive track record as a top M&A practitioner will further bolster our global M&A capabilities and add additional depth to our bench of exceptionally skilled London-based lawyers.”

“I am thrilled to have the opportunity to join the Simpson Thacher team and work with an outstanding group of lawyers who represent market-leading clients on some of the most sophisticated transactions in the global M&A market,” said Mahon.

Mahon was previously a partner at Clifford Chance.

Established in 1884, Simpson Thacher & Bartlett is one of the world’s leading international law firms, with more than 900 lawyers located in offices in New York, Beijing, Hong Kong, Houston, London, Los Angeles, Palo Alto, São Paulo, Tokyo and Washington, D.C.