Simpson Thacher Adds M&A Partner William Lay to Boston Office

Aug. 12, 2025, 6:15 PM UTC

William Lay joined Simpson Thacher & Bartlett as a partner in its mergers and acquisitions practice in Boston, the firm announced Tuesday.

Lay advises private equity sponsors and public companies on complex M&A, carve-outs, joint ventures and other strategic transactions. His work spans numerous industries, including healthcare and life sciences, technology, retail and manufacturing, the firm said.

He joins from Kirkland & Ellis, according to his LinkedIn profile.

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