John R. O’Neil

John R. O’Neil is widely recognized as a global leader in private equity, investment funds, and business law. For more than two decades, he has advised some of the world’s most sophisticated fund sponsors and business leaders on strategy, structure, and operations. Known for innovative solutions, he helps clients navigate complex fundraises, spin-outs, liquidity solutions, and crisis events while shaping the market through thought leadership and practical guidance.

John earned his B.B.A. in Management Information Systems from the University of Wisconsin–Madison before completing his J.D., cum laude, at Northwestern Pritzker School of Law. After clerking on the U.S. Court of Appeals for the Seventh Circuit, he built a practice defined by depth and versatility in fund formation and investment structures. His educational and early career experience continues to guide his client-focused approach to high-value transactions and global fund management challenges.

John has represented major sponsors such as Arctos Sports Partners, GTCR, Landmark Partners, Rhône Capital, Summit Partners, Vista Equity Partners, and Sycamore Partners. His work has led to billions raised in capital commitments across private equity, venture capital, real estate, and secondary funds. As a founding member of an Investment Funds Crisis Management Group, he is a trusted advisor during pivotal events, providing creative strategies to maintain stability and protect investor confidence.

A frequent speaker at global industry conferences, John R. O’Neil is also recognized by Chambers Global, Chambers USA, IFLR1000, Legal 500, and Who’s Who Legal. He serves on professional associations and industry committees focused on private investment funds. His reputation as a “phenomenal lawyer” and trusted business partner reflects his ability to anticipate market shifts, advise on expansion strategies, and guide clients through complex fund lifecycles with clarity and confidence.

Law Office Affiliations

• Partner, Kirkland & Ellis LLP
• Member, National Board for Susan G. Komen
• Member, Private Investment Funds Forum, New York City
• Member, Association of the Bar of the City of New York, Private Investment Funds
• Member, International Bar Association, Investment Funds Sub-Committee
• Member, New York State Bar Association
• Member, Illinois State Bar Association
• Member, Texas State Bar Association
• Member, Massachusetts Bar Association

Licensed State

• New York
• Texas
• Massachusetts
• Illinois

Education

• Northwestern Pritzker School of Law
  Juris Doctor (JD)
• University of Wisconsin-Madison
  BBA in Management Information Systems

Awards & Badges