- Business/Complex Commercial Litigation
- General Civil Litigation
- Cannabis Law

Jesse is a dedicated member of McLane Middleton’s Business Litigation Practice Group, bringing considerable experience in complex litigation. He is also passionate about advising clients in the cannabis industry in both Massachusetts and New Hampshire in order to help both plant-touching and ancillary businesses navigate the evolving legal landscape while supporting their growth and compliance. Jesse has successfully represented businesses and individuals in a broad range of litigation matters in state and federal courts, including commercial and contract disputes, land use matters, and environmental issues, among others.
Before joining McLane Middleton, Jesse served for nearly nine years at the New Hampshire Attorney General’s Office, where he rose to the role of Senior Assistant Attorney General. In this capacity, he prosecuted homicides and other complex criminal cases, honing his skills in trial advocacy and legal strategy. Jesse earned his J.D. from Boston College Law School, where he served as a managing editor of the Boston College Environmental Affairs Law Review. He holds a B.B.A. from the University of Wisconsin-Madison.
Areas of Focus
Admissions
- New Hampshire
- Massachusetts
- U.S. District Court for the District of New Hampshire
- U.S. District Court for the District of Massachusetts
Involvement
- American Bar Association, Cannabis Law and Policy Committee
- New Hampshire Bar Association Leadership Academy Class of 2024
Latest News
- Jesse O’Neill Graduated from the New Hampshire Bar Association’s Leadership Academy (June 11, 2024)
- Attorney Jesse O’Neill Accepted into the New Hampshire Bar Association Leadership Academy Program (August 21, 2023)
- Jesse O’Neill Honored with a Lifetime Achievement Award (June 12, 2023)
- McLane Middleton Adds Jesse O’Neill & David C. Tencza (February 16, 2023)
Appearances
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- “New Hampshire seeks to dismiss claim that DCYF had legal care of Harmony Montgomery” (WMUR-TV – January 16, 2025)
- “Transcripts show NH Supreme Court chief justice contradicting claims made by attorneys for indicted justice” (WMUR-TV – January 16, 2025)
- “Former NH teacher who pleaded guilty to child rape in Massachusetts faces new charges.” (WMUR-TV – September, 19, 2024)
- “Search of Newport home likely result of new information in old case, expert says.” (WMUR-TV – May 22, 2024)
- “Adam Montgomery sentence hearing.” (WMUR-TV – May 9, 2024)
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