Nossaman LLP

Law PracticeCalifornia, United States201-500 Employees

Nossaman LLP is a national law firm that employs attorneys and policy advisors across 12 offices in the United States. It focuses on distinct areas of law and policy and serves specific industries, including transportation, healthcare, financial services, real estate development, water, and employment. Its client roster spans multinational corporations, public agencies, private businesses, trade associations, non-profits, and individuals.

Founded in 1942 in Los Angeles by Walter L. Nossaman, the firm has grown through mergers, notably in 2008 when it merged with O’Connor & Hannan and adopted the current Nossaman LLP name. It maintains a presence in Los Angeles and throughout the country and has earned recognition from legal industry guides for its practice areas such as Eminent Domain, Environment & Land Use, Healthcare, and Infrastructure, among others. In 2026, the firm expanded its footprint in San Francisco with the addition of Michele Kirrane to its employment practice, and added Rosemary Robinson and Nicholas Fortino as partners in the Infrastructure Group in its Orange County office.

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