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Mr. Hennessy’s practice focuses on administrative, environmental, governmental and land use law, with particular experience in litigation in those areas of law.

Areas of Practice

  • Has more than 30 years of experience representing clients in the negotiation and litigation of environmental permitting and enforcement issues, land development, coastal construction matters, water rights, hazardous waste, wetland issues, property rights and eminent domain.

  • Represents clients before all courts in Florida, including the Florida Supreme Court, the 11th Circuit U.S. Court of Appeals, the federal district courts, and the U.S. Supreme Court.

Publications and Presentations

Professional, Civic and Community Involvement

  • Admitted to the U.S. District Courts for the Northern, Middle and Southern Districts of Florida

  • Martindale Hubbell AV® Preeminent™ Peer Review Rated

  • American Bar Association, Section of Environment, Energy, and Resources, Member

  • The Florida Bar, Environmental and Land Use Law Section, Member

  • Manatee County Bar Association, former Director

  • St. Petersburg Chamber of Commerce, Past Chair of the Sustainability Committee and Member of the Transportation Committee.

  • Leadership Pinellas, Class of 2020

  • Habitat for Humanity of Pinellas and West Pasco Counties, The House That Law Built Committee, Member

  • St. Petersburg Bar Association, Wellness Committee, Member

  • University of Florida’s Institute of Food and Agricultural Sciences (UF/IFAS) Natural Resource Leadership Institute, Fellow, 2008-2009

  • Firm Representative to the Environmental Law Network