About A&O Shearman
A&O Shearman is the commonly used name of Allen Overy Shearman Sterling LLP, a multinational law firm formed by merging Allen & Overy with Shearman & Sterling. The merger was completed on 1 May 2024. In the United States, the firm says it practises law through Allen Overy Shearman Sterling US LLP, a Delaware limited liability partnership.
The firm's official site says its US practice advises large corporations, public and private investment funds, family offices and financial institutions. Benchmark Litigation reports that the US work centres on securities, white-collar and regulatory matters, with a developing antitrust practice. The official US office page lists a New York office at 599 Lexington Avenue. Vault describes New York as the US headquarters, alongside other US offices in Austin, Boston, Chicago, Dallas, Houston, Los Angeles, San Francisco, Silicon Valley and Washington, DC.
| Type | Law firm |
|---|---|
| New York offices | New York |
| Phone | +1 212 848 4000 |
| Website | aoshearman.com |
| Registered NY attorneys | 298 |
Practice areas
Areas of work that A&O Shearman describes on its own website. They describe the organization as a whole, not the practice of any individual attorney listed below.
Organization profile based on its official website and public sources (reviewed October 29, 2026). Attorney list from the New York State Unified Court System registration data. Not affiliated with A&O Shearman.
Registered attorneys
Charles Gittleman Currently registered William Yaro Currently registered Rohan Weerasinghe Currently registered William Roll Currently registered John Sykes Currently registered William Schwitter Currently registered Cynthia Urda Kassis Currently registered Manuel Orillac Currently registered Susan Hobart Currently registered Maura O'Sullivan Currently registeredRegistration status can change at any time. Confirm any attorney's current status through the official New York Attorney Search.