Robert W. Sadowski PLLC


Who are we?

Robert W. Sadowski


Robert W. Sadowski is a trial and appellate attorney specializing in qui tam cases. He is an experienced litigator, and has successfully prosecuted cases in many areas, including; elder care fraud, disability rights, wrongful termination cases, bankruptcy litigation, investment fraud, and tax fraud.

Before going into private practice, Rob held the position of health care fraud coordinator in the United States Attorney’s Office for the Southern District of New York, where he was responsible for supervising all civil health care fraud prosecutions. He also supervised the investigation, litigation and settlement of fraud prosecutions under the False Claims Act.

Prior to working for the United States Attorney, Rob, worked as an Internal Revenue Service trial attorney for four years.

Speaking Engagements / Affiliations

Rob is an adjunct professor at Brooklyn Law School and a faculty member of Lawline. Rob frequently speaks to lawyers, accountants and health care professionals about whistleblowers and the False Claims Act, fraud topics, and healthcare law issues, and has made numerous television appearances.


United States Attorney’s Office Attorney General’s John Marshall Award

United States Attorney’s Office Director’s Award for Superior Performance

Super Lawyer 2008 through present


Rob is admitted to practice in New York, the United States District Courts for the Southern, Eastern, and Northern Districts of New York, and the Court of Appeals for the First and Second Circuits.


Rob has a B.A. from the University of Wisconsin, a J.D. from Brooklyn Law School, and an LL.M in Taxation from NYU Law School.


Taxpayers Against Fraud Education
Michael J. DeRienzo


Michael J. DeRienzo is an experienced litigation attorney specializing in fraud and public interest cases as well as alternative dispute resolution.

After first working at Sadowski Fischer PLLC in 2015, Mike worked at boutique and mid-sized firms in New York City, where he focused on whistleblower representation under the U.S. Securities and Exchange Commission (SEC) Whistleblower Program and other whistleblower programs. In 2017, Mike opened up his own practice to continue what he learned under Rob litigating qui tam and public interest cases, and in 2019, joined Robert W. Sadowski PLLC as “Of Counsel”.


Mike is admitted to practice in New York, New Jersey, and the United States District Courts for the Southern and Eastern Districts of New York.


Mike has a B.S. from the Bentley University and a J.D. from Villanova School of Law.


New York City Bar Association