JACK PIROZZOLO focuses his practice on high stakes government facing and government adjacent litigation. His matters cross the spectrum of criminal, civil and regulatory enforcement litigation, with a particular emphasis on heavily regulated industries, such as healthcare, life sciences, energy, and financial services. Since his arrival at Sidley in 2014, Jack has successfully represented companies and individuals being investigated by or charged by U.S. Attorneys’ Offices, the U.S. Department of Justice, the Securities and Exchange Commission, the U.S. Department of Labor, the Massachusetts Attorney General’s Office, the New York Attorney General’s Office, the New York Department of Financial Services, and various other state and federal agencies. As lead counsel, he has handled and is currently handling several high-profile matters in various courts around the country and has secured dismissals and declinations in several matters while at Sidley. Jack has also conducted several internal investigations and routinely provides compliance advice to his clients. Jack leads Sidley’s pro bono efforts in Boston, which has included several high profile matters and has received multiple awards.
Jack joined Sidley after a 10-year career in the U.S. Attorney’s Office for the District of Massachusetts, the last five years of which he served as the First Assistant U.S. Attorney. Prior to joining the U.S. Attorney’s Office, Jack was a partner at a Boston-based law firm where, among other things, he focused on defending accountants and auditors in securities class actions.
Jack has been recognized by The Best Lawyers in America® in the areas of Litigation — Regulatory Enforcement (SEC, Telecom, Energy) and Commercial Litigation (2017–2025) and as a “Lawyer of the Year” in Litigation - Regulatory Enforcement (SEC, Telecom, and Energy) in Boston (2018 and 2024). In 2022, Jack was recognized as a “Go To Lawyers: Business Litigation” by Massachusetts Lawyers Weekly. Jack is also a member of the American Law Institute. Jack has been recognized by Chambers USA for Litigation: White-Collar Crime & Government Investigations in Massachusetts (2024).
Jack received his undergraduate degree from Yale University. He attended the University of Chicago Law School, where he was comment editor of the University of Chicago Law Review, graduated with honors, and was elected to the Order of the Coif. Jack clerked for both Judge Sandra L. Lynch on the First Circuit and Judge Edward R. Becker on the Third Circuit.