Sandler O'Neill and Partners
Sandler O’Neill + Partners, L.P., is a full-service investment banking firm and broker-dealer focused on the financial services sector. It is headquartered in New York City, and has offices in Boston, Chicago, San Francisco and Atlanta.
The firm provides investment banking services to financial institutions and their investors. Its services include merger and acquisition advisory, capital markets, fixed income and equity trading and sales, equity research, balance sheet management, mortgage finance, and consulting services. It has retained its private partnership structure and it perennially ranks among the top advisers on bank and thrift mergers as well as in capital raising.
September 11 
On September 11, 2001 the firm lost 66 of its 171 Principals and employees in the terrorist attacks that destroyed the World Trade Center. Among them were Herman S. Sandler and Chris Quackenbush, who started the firm’s investment banking practice. The company also lost its entire computer system and nearly all of its records in the destruction.
On September 17, 2001 Sandler O’Neill announced it was open for business.
See also 
- http://money.cnn.com/magazines/fortune/fortune_archive/2002/01/21/316599/index.htm Fortune magazine 2002 cover story on Sandler O'Neill
- http://www.nytimes.com/2006/03/17/business/17bank.html?_r=1&scp=9&sq=Sandler+O%27Neill&st=nyt New York Times story on investment bank’s relationship with NorthFork Bank
- http://select.nytimes.com/2006/09/09/business/09nocera.html?scp=11&sq=Sandler+O%27Neill&st=nyt New York Times interview with Senior Managing Principal James J. Dunne III
- Sandler O'Neill + Partners in the news
- THE MOURNER: In a Landscape of Sadness, Offering Just Her Presence, New York Times, 10/1/2001 the story of Carol O'Neill, wife of a founder of Sandler O'Neill