John P. Gardella


John Gardella is a Shareholder and Chief Services Officer at CMBG3 Law.  He is licensed to practice in Massachusetts and Tennessee.

A seasoned trial attorney with over 75 verdicts, John is the Chair of the firm’s PFAS, Environmental, Risk Management & Consulting, and ESG practice groups. His thought leadership and predictive risk abilities with respect to PFAS earned him the honor of being the only person in the country that was recognized as a thought leader on PFAS in 2020 and 2021 by the esteemed National Law Review. John is regularly interviewed by media on the subject of PFAS and other emerging chemicals of concern, and he consistently publishes his own thought leadership in several nationally syndicated resources, including Bloomberg Law, AM Best, and National Law Review. Private equity firms, the financial world, insurance companies, and corporations regularly seek John’s opinions on forward-looking environmental and chemical substances risk issues.

In his environmental and toxic torts practice, John represents companies ranging in size from small mom-and-pop businesses to Fortune 100 and Fortune 500 companies. Companies seek John’s expertise on matters ranging from compliance planning and audits to litigation of pending cases.

John also Chairs the firm’s CMBG3 Cares charitable program; is a member of the Association for Corporate Growth, the USA 500 Clubs, and the Environmental Business Council; and actively participates in and supports the firm’s DEI initiatives.

Outside of work, John is committed to supporting various charitable organizations, specifically through raising money for them through marathon and triathlon participation. Through these efforts, John has raised over $30,000 for the Martin Richard Foundation and Autism Speaks.



  • 2000: Vanderbilt University, magna cum laude, B.A. Economics, minor Japanese
  • 2003: Vanderbilt University Law School, J.D. (Associate Editor of the Vanderbilt Transnational Law Journal)


  • Massachusetts
  • Tennessee
  • United States District Court for the District of Massachusetts


  • Only attorney in the country named a National Thought Leader on PFAS by the National Law Review, 2020-2021
  • Selected to Super Lawyers: 2017 – 2021
  • Rated “AV-Preeminent” by Martindale-Hubbell, signifying the highest level of legal knowledge, analytical capabilities, judgment, communication ability, and legal experience.
  • Named to the “Rising Stars” list in New England Super Lawyers for five years, including 2016.  Only 2.5% of the attorneys in Massachusetts are selected as “Rising Star” Super Lawyers.
  • Also listed as a Massachusetts “Super Lawyer” for 2017 – 2019.
  • Selected to Rising Stars: 2008, 2011 – 2012, 2015 – 2016

In the Media

Speaking Engagements

  • “Glyphosate: Emerging Litigation Trend in MA and Beyond”, Massachusetts Defense Lawyers’ Association; April 2019
  • “Talc Litigation: Getting Ahead of the Next Wave”, EECMA Conference; May 2018
  • In house corporate presentations on glyphosate and talc litigation trends and future predictions