Guillaume Buell is a Partner in the New York office of Labaton Keller Sucharow LLP. He is an experienced and trusted advisor to a wide range of institutional investors in the United States, the United Kingdom, Canada, and Europe regarding global securities litigation, corporate governance matters, and shareholder rights. His clients include pension funds, asset managers, insurance companies, and other sophisticated investors. As part of the Firm’s Non-U.S. Securities Litigation Practice, which is one of the first of its kind, Buell serves as liaison counsel to institutional investors in select overseas matters.
Lawdragon Honors
| Honor | Year | Practice |
|---|---|---|
| The 2026 Lawdragon 500 Global Plaintiff Lawyers | 2026 | Non-U.S. Securities Litigation |
| The 2025 Lawdragon 500 Global Plaintiff Lawyers | 2025 | Non-U.S. Securities Litigation |
| The 2024 Lawdragon 500 X – The Next Generation | 2024 | Plaintiff Securities Litigation, esp. International |
| The 2024 Lawdragon 500 Global Plaintiff Lawyers | 2024 | Non-U.S. Securities Litigation |
| Lawdragon 500 X – The Next Generation | 2023 | Plaintiff Securities Litigation, esp. International |
Buell has played an important role in cases against CVS Caremark, Uniti Group, NuSkin Enterprises, Conduent, Stamps.com, Genworth Financial, Rent-A-Center, and Castlight Health, among others.
Prior to joining Labaton Keller Sucharow, Buell was an attorney with Cahill Gordon & Reindel LLP in New York and Hicks Davis Wynn, P.C. in Houston, where he provided legal counsel to a wide range of Fortune 500 and other corporate clients in the aviation, construction, energy, financial, consumer, pharmaceutical, and insurance sectors in state and federal litigations, government investigations, and internal investigations.
Buell is an active member of the National Association of Public Pension Attorneys (NAPPA), where he serves as an appointed member of its Securities Litigation Committee, Fiduciary & Governance Committee, and the New Member Education Committee. In addition, he is actively involved with the National Conference on Public Employee Retirement Systems (NCPERS), the Association of Canadian Pension Management (ACPM), the Michigan Association of Public Employee Retirement Systems (MAPERS), the National Association of Shareholder and Consumer Attorneys (NASCAT), and the International Foundation of Employee Benefit Plans (IFEBP).
Buell received his Juris Doctor from Boston College Law School and was the recipient of the Boston College Law School Award for outstanding contributions to the law school community. He was also a member of the National Environmental Law Moot Court Team, which advanced to the national quarterfinals and received best oralists recognition. While in law school, Buell served for the Honorable Loretta A. Preska, United States District Court for the Southern District of New York, and later in the Government Bureau of the Attorney General of Massachusetts. He received his Bachelor of Arts, cum laude with departmental honors, from Brandeis University.
Buell is fluent in French and conversant in German. He is an Eagle Scout and actively involved in his hometown's local civic organizations.