J.H. Cohn, a regional accounting firm with offices in New York, New Jersey and the Cayman Islands, announced this morning that it had purchased Haggett Longobardi, the Glastonbury public accounting and consulting firm founded in 1984. Since being formed by Robert M. Haggett and Frank P. Longobardi, Haggett Longobardi grew to become the seventh largest accounting firm in the state, reporting 38 CPAs in January. Its clients include manufacturers, distributors and real estate developers, many of whom have operations overseas. It is the second recent buy for J.H. Cohn; the company purchased New York City-based Berenson LLP in May.