Kathleen M. Mahan

Peter W. Leberman is a top attorney recognized by Best Lawyers in the practice area(s) of Closely Held Companies and Family Businesses Law, Corporate Law and Mergers and Acquisitions Law. Peter W., 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 Peter W. is held by other top lawyers in the same geographic and legal practice area.

James O’Shaughnessy focuses his practice on the representation of public school districts, school boards, and other educational institutions, including charter schools and private schools. As leader of the firm’s New Hampshire school law group, Jim’s practice involves the full spectrum of school law matters, including board representation and governance, school district and SAU organization and budgets, cooperative and regional school district issues, school district annual ...

Joseph G. Mattson is a top attorney recognized by Best Lawyers in the practice area(s) of Insurance Law and Medical Malpractice Law - Defendants. Joseph G., who practices law in Manchester, New Hampshire, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Joseph G. is held by other top lawyers in the same geographic and legal practice area.

Since joining Nixon Peabody almost 20 years ago, Phil has had the pleasure of advising investors, middle market private companies, large public companies, entrepreneurs and C-level executives in many different kinds of corporate transactions, all over North America, Europe, Asia and Africa. Phil was born in Southern Africa and finished his secondary education in the United States. His love of family, travel, outdoor adventure and community permeates everything he does. Phil has been described...

Dean has extensive experience representing school districts throughout the state in matters involving general school law and federal special education law. He is also an AV-rated jury trial lawyer with trial experience in the area of commercial litigation, products liability defense and municipal representation. He has represented manufacturers, distributors, banks, retailers and developers in complex commercial litigation, including computer conversion, anti-trust, products liability, breach...

Bill concentrates his practice on tax-exempt financing transactions, land use and zoning, and commercial real estate transactions. He has served as counsel to borrowers, purchasers, and issuers in connection with the issuance of over a billion dollars in tax-exempt bond financings. In addition to serving as general counsel to the New Hampshire Health and Education Facilities Authority, Bill has represented a wide range of borrowers, including schools, colleges, universities, hospitals, and nu...

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.

Ned takes and wins tough cases. As a litigator and a trusted advisor, Ned has guided his clients through their most complicated and difficult problems. He has won at trial. He has gotten cases dismissed on the papers. He has pierced the corporate veil to collect debts. And, he has made new law at the New Hampshire Supreme Court in order to protect his clients. Ned’s areas of expertise include: Trademark, copyright, and trade secret litigation Ned has litigated “soft IP” disp...

John Beals is a partner in Nixon Peabody's Private Equity and Investment Funds practice. He represents public pension funds, funds of funds and other institutional investors in connection with their investments in leveraged buyout, venture capital, real estate and debt private equity funds. He also advises fund sponsors in structuring and forming such funds. What do you focus on? I focus my practice on two main areas, leveraging 20 years of experience to help clients structure, negotiate and ...

Margaret has over twenty-five years of experience concentrating on high-asset and complex divorce cases. Margaret’s clients include business owners, public figures, elected officials, executives of publicly traded companies, successful inventors, tech entrepreneurs, attorneys, doctors, dentists, retirees, those with generational wealth, and many others. Her cases regularly involve issues relating to the valuation and division of complex assets such as business interests, private equity,...