James Ostaszewski


James Ostaszewski prosecutes complex class action cases on behalf of investors. Currently, he is litigating cases related to foreign exchange trading and breaches of fiduciary duty.

Prior to joining Zamansky LLC, James was a litigation associate at Boies, Schiller & Flexner LLP and then at Labaton Sucharow. At these firms, James specialized in complex financial fraud litigation, representing both institutional investors and major financial institutions. James has prosecuted cases against major U.S. stock exchanges related to improper market manipulation, as well as multi-billion dollar fraud cases against various financial and pharmaceutical institutions, and has successfully recovered billions of dollars for his clients. He has also actively participated in pro bono legal service, litigating landmark civil rights cases regarding marriage equality, representing international victims of torture seeking asylum, and successfully reuniting parents who had been separated from their children while crossing the border in pursuit of asylum claims.

Earlier in his legal career, James worked as a judicial clerk for the Honorable David G. Trager in the Eastern District of New York, and as a legal intern for the King’s County District Attorney’s Office. James received his J.D., magna cum laude, from Brooklyn Law School, where he served as Articles Editor of the Brooklyn Law Review. He earned his B.S. in Physics, summa cum laude, from St. John’s University.

Currently, James is actively involved in the New York City Bar Association’s Task Force on Puerto Rico. He also participates in pro bono legal service, providing legal assistance to low-income clients being sued by debt collectors in state court.