William S. Gannon

Ronald L. Abramson is a top attorney recognized by Best Lawyers in the practice area(s) of Immigration Law. Ronald L., who practices law in Manchester, New Hampshire, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Ronald L. is held by other top lawyers in the same geographic and legal practice area.

Nancy E. Oliver is a top attorney recognized by Best Lawyers in the practice area(s) of Employment Law - Management and Litigation - Labor and Employment. Nancy E., who practices law in Portsmouth, New Hampshire, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Nancy E. is held by other top lawyers in the same geographic and legal practice area.

Karen A. Whitley is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - Labor and Employment. Karen A., who practices law in Portsmouth, New Hampshire, has been recognized since 2020. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Karen A. is held by other top lawyers in the same geographic and legal practice area.

Tabitha Croscut is a top attorney recognized by Best Lawyers in the practice area(s) of Closely Held Companies and Family Businesses Law, Corporate Governance Law and Mergers and Acquisitions Law. Tabitha, who practices law in Manchester, New Hampshire, has been recognized since 2022. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Tabitha is held by other top lawyers in the same geographic and legal practice area.

Anna Cole delivers well-informed, creative advice to support employers, including schools and colleges, municipalities, private entities, and Tribal Nations, as they navigate the ever-changing landscape of labor and employment laws. Co-Leader of the firm’s Labor and Employment Practice Group, Anna represents employers in collective bargaining negotiations, contract administration, and grievance and arbitration proceedings. Additionally, she represents employers before the state and fede...

Bob has extensive commercial litigation experience including administrative agency proceedings, arbitrations, jury trials and appellate practice involving both multi-national corporations and small businesses. He regularly advises clients on antitrust compliance issues. His practice focus also includes environmental litigation and arbitration; patent, trademark, trade secret disputes; stockholder and partnership disputes; and motor vehicle /dealership disputes. Bob is the firm’s liaison...

Whether working with an emerging company or an established enterprise, an issuer of securities or an investor, Scott Pueschel distills his years of experience in business formations, business combinations and securities offerings into clear advice his clients can use. Scott prides himself on his ability to take a fresh look at a problem or issue while drawing on past experience to arrive at a straightforward and streamlined solution. Throughout his career, Scott has worked with buyers and sel...

Mark represents individuals and their claims and disputes relative to bodily injury claims, workers’ compensation claims, insurance coverage disputes, and social security disability claims. Mark’s experience in bodily injury claims includes motor vehicle accidents, general tort claims, product’s liability claims and medical malpractice claims.

Shawn Tanguay is a top attorney recognized by Best Lawyers in the practice area(s) of Land Use and Zoning Law. Shawn, who practices law in Manchester, New Hampshire, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Shawn is held by other top lawyers in the same geographic and legal practice area.

Bob has been a member of Sheehan Phinney since 1992. Prior to that, he served from 1981 to 1992 in the New Hampshire Attorney General’s Office. During his tenure Bob worked in the Attorney General’s Environmental Bureau and was chief of the Environmental Bureau from 1984-1988. While Associate Attorney General from 1989-1992, Bob also served as general counsel to the Pease Development Authority (PDA) and the Pease Redevelopment Commission (PRC). His responsibilities included workin...