Jeanmarie P. Costello, a proud native of Riverhead, New York, boasts an impressive legal journey. Graduating summa cum laude from St. Francis College in 1978 and obtaining her law degree from St. John’s University School of Law in 1981, Jeanmarie brings decades of experience to the table.

Admitted to practice law in all New York State Courts in March 1982, Jeanmarie is also licensed in the United States District Court for the Eastern and Southern Districts. Her early career included internships at prestigious legal entities like the Suffolk Country District Attorney’s Office and the U.S. Department of Justice.

Since January 1986, Jeanmarie has carried on her late father's legacy as an Attorney-at-Law, establishing her private practice at 455 Griffing Avenue, Riverhead, New York. Specializing in matrimonial and family law, wills and estates, and real estate, Jeanmarie offers expert legal guidance rooted in experience and dedication.