Eisner LLP has merged with Amper, Politziner & Mattia LLP to create a new accounting firm with over $250 million in annual revenue.

The combined entity, EisnerAmper LLP, will focus on clients in the Northeast region and has more than 1,200 staff and 170 partners. Its principal practice groups provide a variety of accounting, tax and other related services to closely-held and publicly traded firms, financial institutions and high net worth individuals and families.

Aside from accounting, audit and tax, the new company's advisory services include enterprise risk management, mergers and acquisitions, business and asset valuation, debt financing, internal audit, forensic accounting and litigation consulting, reorganization and insolvency and international expansion, EisnerAmper said in a release. It will serve clients from its 11 offices located across New York, New Jersey, Philadelphia and the Cayman Islands.

"This combination is based on a strong foundation of trust that extends to the partners at both firms," Charly Weinstein, the firm’s new chief executive officer, said.

"Our teams have already begun working in concert to ensure not only a seamless transition for clients, but also to deliver to them the maximum benefits of our greater combined resources. This is truly a situation where the whole is greater than the sum of its parts."