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

  • Frequent lecturer on topics including coastal construction, water law, endangered species, administrative law and environmental litigation

  • Litigation Advice for the Land Use Practitioner: Hope for the Best, Prepare for the Worst, Environmental and Land Use Law Section of the Florida Bar Live Webcast, December 2016

  • Extreme Environmental People Skills, Florida Chamber Environmental Permitting Summer School, 2008-2016

  • What to do if you receive a Complaint filed with the Commission on Ethics, September 2014

  • Seeing the Complete FOG Picture, Journal AWWA, January 2014

  • U.S. Supreme Court Offers Clean Water Act Plaintiffs Their Day in Court, co-authored with Tara Duhy, Journal AWWA, June 2012

  • Are City Governments and Social Media a Good Match?, Quality Cities Magazine, February 2012

  • What You Gonna Do when the Well Runs Dry: Protection of Rights to ASR Water, ABA Water Resources Committee Newsletter, Vol. 12, No. 2, co-authored with R. David Jackson, Esq., January 2010

  • Aquifer Storage and Recovery, Vail Water Law Conference, 2010

  • Greenwashing: A Guide to the Ethical Advertising of Green Products, co-authored with Michelle Diffenderfer, Esq., Manatee Chamber, 2009

  • The Lower St. John’s River Basin Management Action Plan: Assessing Agricultural, Local Government and Environmental Perspectives, co-presented with Tatiana Borisova, Laila Racevskis, Jennison Kipp, Debra Butler and Diana Ferguson, NRLI Practicum Presentation, 2009

  • Coastal Construction Below the Mean High-Water Line, The Florida Bar, February 2001

  • Thirty-Year Erosion Zone, Florida Environmental and Land Use Law Treatise, February 2001

Professional, Civic and Community Involvement

  • 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

  • Manatee County School Board, Sales Tax Accountability Committee, Member

  • Manatee County Chamber of Commerce, Green Business Initiative 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

  • Lakewood Ranch Business Alliance, Member