James D. (JD) Mazzocco

Area of Emphasis

JD Mazzocco is an associate in Babst Calland’s Environmental and Litigation groups.  His practice focuses on environmental and complex commercial litigation.  His environmental litigation experience includes representing businesses in environmental cost recovery cases and federal, state, and local environmental regulatory matters, including large-scale citizen suits and environmental class action cases.  Mr. Mazzocco has extensive experience representing clients in trials and hearings in federal and state courts, as well as before administrative bodies and arbitration panels.

His complex commercial litigation experience includes representing clients in a wide variety of matters, including toxic tort actions, contract and lease disputes, unfair trade practices claims, shareholder disputes, and personal injury claims.


Mr. Mazzocco received his B.A. in English and a minor in Chemistry, cum laude, from Gettysburg College in 2011.

Mr. Mazzocco received his J.D. from Duquesne University School of Law in 2014.  During law school, he served as an intern at several law firms in the Pittsburgh area, worked as a teaching assistant, and was an award-winning individual and team member of Duquesne University’s Appellate Moot Court Board, competing in the Federal Bar Association Thurgood A. Marshall Memorial Moot Court Competition and the WVU National Energy & Sustainability Moot Court Competition.

Memberships and Affiliations

Mr. Mazzocco was admitted to the Pennsylvania Bar in 2014.  He is also admitted to the United States District Court for the Western District of Pennsylvania and is a member of the Allegheny County Bar Association.

Mr. Mazzocco received a Best Lawyers®: Ones to Watch recognition from BL Rankings for Litigation – Environmental since 2021, Transportation Law since 2022, and Construction Law for 2024. He has been selected to the Pennsylvania Rising Stars list (Thomson Reuters) since 2018.