
Mergers & Acquisitions
Private Equity
Corporate Governance
Securities Law
David B. Feirstein, P.C. is a corporate partner at Kirkland & Ellis LLP, based in the New York office. With a focus on mergers and acquisitions, corporate and securities law, and corporate governance, David represents a diverse range of clients including public companies, private equity sponsors, and private companies. His expertise extends to leveraged buyouts, carve-out transactions, spin-offs, and joint ventures. Recognized by Chambers USA and other prestigious legal directories, David is praised for his intelligence and efficiency. He also contributes to academia as an adjunct professor at NYU Law, teaching corporate transaction negotiation.
Mergers & Acquisitions
Private Equity Investments
Energy and Natural Resources
Healthcare and Life Sciences

- Onex Partners V and other founding institutional equity partners in Convex Group Limited sold the stake/assets to Onex Corporation and American International Group, Inc. (AIG) as part of a M&A transaction on not available. - Deal value was 7000000000 (source: Extracted) Sector: Insurance; Location: not available. - On the seller side, not available advised, led by Alvaro Membrillera, Adrian Duncan, David Feirstein, Rajab Abbassi, Doug Bacon.
Oct 30 2025
7B
Private Equity

Partner
2011 – Unknown
Associate
2005 – 2011

- Celanese Corporation sold the stake/assets to Element Solutions Inc. as part of a divestiture on not available. - Deal value was 500000000 (source: Extracted) Sector: Chemicals; Location: USA. - On the seller side, not available advised, led by David Feirstein, Jennifer Gasser, Haley Vincent, Dani Blain, Adam Pile, Benjamin Schreiner, Rachel Malhiet, Liam Underwood, Dan Lewis, Todd Herst, Camilo Mesa, Michelle Sliwinski DeMaio, Carter Vella.
Oct 29 2025
500M
M&A
1 min
BA in Political Science, University of Pennsylvania