Founding Partner
Jeffrey A. Denner
More than 50 years of trial and appellate advocacy in complex, high-stakes matters.
Professional biography
Attorney Jeffrey A. Denner is a founder and partner of Denner Lamanna. For over 50 years, Mr. Denner has concentrated his practice in the defense of complex, often high-profile cases on behalf of individuals and organizations throughout both the United States and internationally. He also involves himself in selected civil cases, particularly for individuals whose civil rights have been violated by the Government.
Mr. Denner’s practice encompasses both trials and appeals in the state and federal court systems as well as before administrative (licensing, regulatory and disciplinary) boards and agencies. His legal representation commences at the investigative, pre-indictment/pre-charging stage and carries through to appeal, post-conviction, and parole/pre-release, as applicable.
A graduate of Yale College and Harvard Law School, Mr. Denner is admitted to practice in Massachusetts, the U.S. District Court for Massachusetts, the First Circuit, the U.S. Court of Appeals for the Armed Forces (formerly U.S. Court of Military Appeals), the U.S. Claims Court, the U.S. Tax Court, and the U.S. Supreme Court. He has litigated in approximately 35–40 jurisdictions and across four continents.
He is a member of the Massachusetts Bar Association, the National Association of Criminal Defense Attorneys, and the Massachusetts Association of Criminal Defense Attorneys. He is a former clinical Teaching Fellow at Harvard Law School.
Mr. Denner can be reached at (617) 886-5188.
Bar admissions & education
Bar admissions
- Massachusetts
- U.S. District Court District of Massachusetts
- U.S. Court of Appeals 1st Circuit
- U.S. Court of Appeals for the Armed Forces (formerly U.S. Court of Military Appeals)
- U.S. Court of Federal Claims
- U.S. Supreme Court
- U.S. Tax Court
Education
Harvard Law School, Cambridge, Massachusetts
J.D. — 1973
Yale University
B.A. — 1969
Media & commentary
Selected appearances and profiles—offered as context for how courts and the press intersect in high-visibility defense work.
Representative matters
Selected outcomes and mandates—linked to related practice areas. Attorney advertising; prior results do not guarantee future outcomes.
- Commonwealth v. Timothy Cahill — all charges dismissed after mistrial · Case summary · Public corruption defense
- Clark Rockefeller impostor prosecution — nationally televised trial defense · Case summary · State criminal trials
- Big Dig tunnel collapse litigation — reported aggregate recovery · Case summary · Construction accidents
- McIntyre v. United States — federal civil-rights accountability · Case summary · Section 1983 litigation
- United States v. Rexroad — courts-martial appellate practice · Case summary · Court-martial defense
- Kettenbach v. Demoulas — high-stakes shareholder litigation · Case summary · Shareholder disputes
Credentials & affiliations
Admitted to the U.S. Court of Appeals for the Armed Forces (formerly the U.S. Court of Military Appeals)—integrating military justice appellate practice with state, federal, and international trial defense.
Massachusetts BBO registration
Board of Bar Overseers #: 120520
Bar admissions & courts
- Massachusetts
- U.S. District Court for the District of Massachusetts
- U.S. Court of Appeals for the First Circuit
- U.S. Court of Appeals for the Armed Forces (formerly U.S. Court of Military Appeals)
- U.S. Court of Federal Claims
- U.S. Tax Court
- U.S. Supreme Court
Selected publications & reported decisions
- United States v. Tedeschi, 774 F.2d 511 (1st Cir. 1985)
- Commonwealth v. Selby, 426 Mass. 168 (1997)
- Socialist Workers Party v. Davoren, 378 F. Supp. 1245 (D. Mass. 1974)
- Kettenbach v. Demoulas, 901 F. Supp. 486 (D. Mass. 1995)
- McIntyre v. United States, 254 F. Supp. 2d 183 (D. Mass. 2003)
Professional affiliations
Additional credentials
- Former Clinical Teaching Fellow, Harvard Law School
- Former Clinical Teaching Associate, Suffolk University
- Languages: Spanish
Related practice areas
Jeffrey Denner represents clients in high-stakes trial and appellate matters across state, federal, military, and international forums.
State and federal defense for investigations, trials, and consequential criminal allegations.
Explore practice Related practice Civil RightsCivil-rights litigation involving government misconduct, constitutional claims, and Section 1983.
Explore practice Related practice Military LawCourt-martial defense, military appeals, and administrative military proceedings.
Explore practice Related practice Appellate LitigationPreserving issues and presenting complex records in state and federal appellate courts.
Explore practice