Mr. Hartzell focuses his practice on representing both plaintiffs and defendants in complex civil litigation matters including commercial disputes, securities litigation and investigations, directors and officers, business torts, trade secrets, civil RICO, insurance coverage, including environmental, medical device litigation, class actions, real estate, contract actions, aviation, workplace and employment related matters, including discrimination claims, construction, whistleblower litigation and environmental including Chapter 21E and CERCLA claims, banking litigation, creditors and debtors in bankruptcy proceedings, claims involving accountants, attorneys, design professionals as well as governmental investigations.

Mr. Hartzell served as lead counsel in major cases involving environmental contamination, bank fraud, professional liability, securities, directors and officers, toxic tort, product liability, personal injury, class actions, and commercial disputes.  He has appeared before state and municipal boards and agencies and represented witnesses before federal and state grand juries.  As trial counsel, he has obtained multi-million dollar verdicts, some of the largest in Massachusetts, in the area of environmental contamination. Recent decisions include obtaining summary judgment in cases involving federal qui tam litigation, discrimination and claims of interference with contractual relations. He has also successfully mediated numerous disputes, including legal and accounting malpractice and professional liability claims.  He also has extensive experience representing various entities, including the Program Manager, in connection with the Central Artery/Tunnel Project, one of the most complex construction projects in U.S. history.