CALLAGHAN LLP is a full service certified public accounting firm providing tax, accounting and consulting services to businesses and individuals. The firm’s business clients range from start-ups entities to medium size businesses engaged in a wide range of sectors including real estate, hospitality, service, manufacturing, legal, engineering, architecture, and retail. The firm’s individual practice provides tax, bookkeeping and consulting services for business owners as well as moderate to high-net-worth individuals and family offices.

The main office is located in Hauppauge, New York and an additional office is located in Orlando, Florida.


John Callaghan founded Callaghan Nawrocki LLP in Melville, NY in 1986 after departing from one of the original, “Big 8” accounting firms, Arthur Andersen & Company. In 2007, Callaghan Nawrocki LLP was reorganized, and Callaghan Lucerino & Associates LLP was formed in Smithtown, NY. Upon the semi-retirement of partner Patricia Lucerino, in 2021 Callaghan Lucerino LLP was reorganized and CALLAGHAN LLP was formed and relocated to Hauppauge, NY.


The firm takes tremendous pride by offering sophisticated accounting, tax planning and compliance services and maintaining the highest professional standards. We have an outstanding group of professionals that adhere to the highest ethical standards, professionalism, and commitment to excellence.

In an era of constant change, we actively keep pace with the demands to provide innovative, effective, and timely solutions to complex matters.