Giselle Frieda Mazmanian

Giselle Mazmanian advises clients on complex environmental regulatory and transactional matters. Her practice encompasses Superfund and RCRA remediation, environmental due diligence, brownfield redevelopment, and regulatory compliance. She also counsels clients on emerging contaminants, including per- and polyfluoroalkyl substances (PFAS), cross-border environmental matters, and environmental, social, and governance (ESG) policies and programs. Before joining the firm, Giselle practiced environmental and energy law for nearly a decade at a leading Canadian law firm, advising clients across a range of industries on environmental regulatory, transactional, and litigation matters. Her experience practicing in both the United States and Canada provides her with a valuable perspective on the legal and regulatory challenges facing businesses operating across borders. Prior to her legal career, Giselle worked as an environmental scientist and engineering consultant. Drawing on this multidisciplinary background, she combines legal and technical insight to help clients evaluate environmental risks, navigate complex regulatory requirements, and develop practical strategies for regulatory matters and environmental litigation. Giselle is admitted to practice in New York and Ontario and is recognized by the Law Society of Ontario as a Certified Specialist in Environmental Law. She has been named a “Lawyer to Watch” in mining and energy law by Lexpert Canada and is a recipient of the Armenian Bar Association’s “20 Under 40 Rising Stars” Award. Giselle serves as Chair of the Remediation and Chemicals Subcommittee of the New York City Bar Association’s Environmental Law Committee and is an active member of the Environmental Law Network’s Future Leaders’ Division. In her free time, Giselle enjoys hitting the tennis court, going for a run and playing the piano.