Viggo is a Director in the firm’s Administrative Law Department where he maintains a diverse environmental and energy regulatory and litigation practice.  In his regulatory practice, Viggo represents regional and national clients in complex energy and environmental permitting matters, including permitting of energy facilities before the New Hampshire Site Evaluation Committee, and assists clients in navigating, and complying with, the numerous State and federal environmental laws.  Viggo has significant experience advising clients on matters of solid waste, hazardous waste, contaminated sites, and emerging contaminants such as PFAS.  He also assists clients in managing environmental risks and liabilities in commercial transactions.

In his litigation practice, Viggo defends clients facing State and federal administrative or civil enforcement actions and citizen suits in both State and federal courts.  He routinely represents clients in environmental appeals before the New Hampshire environmental appeal councils He successfully represented a major solid waste management company facing an appeal of its solid waste facility permit before the New Hampshire Waste Management Council and on appeal to the New Hampshire Supreme Court.  Viggo has gained recognition among his peers for his expertise and experience, both in the regulatory and litigation cases, with per and polyfluoroalkyl substances (PFAS) and other contaminants of emerging concern.

Viggo received his J.D., cum laude, and Master of Energy Regulation and Law degree, magna cum laude, from Vermont Law School (2015), and his B.A. in English from Providence College (2010). While in law school, Viggo worked as a Research Analyst at Vermont Law School’s Institute for Energy and the Environment and as a Clinician in the Energy Clinic. In addition, Viggo worked as a Markets and Policy Intern in the National Renewable Energy Laboratory’s Strategic Energy Analysis Center in Golden, Colorado.