Mr. Diffenderfer maintains a diverse governmental practice involving complex environmental and land use matters, including representation before local, state and federal legislative and regulatory bodies. Mr. Diffenderfer is Chair of the firm’s Business Development Committee.
Areas of Practice
Immediate Past Chair of the firm's transportation and infrastructure industry group for major public infrastructure projects, including highway, port and airport planning and permitting and Development of Regional Impact (DRI) review.
Represents private and public clients, counseling on growth management issues and obtaining comprehensive plan and zoning approvals; defends those approvals from third party challenge.
Represents special districts on a variety of organizational and operational issues and special projects.
Successfully represented state university interests in obtaining legislation to authorize the transfer of land from the Trustees of the Internal Improvement Trust Fund to the university's foundation.
Has handled a variety of growth management, land use and regulatory issues for large public infrastructure projects various Florida Department of Transportation highway projects including: Fort Lauderdale-Hollywood International Airport, Palm Beach International Airport, North Palm Beach County General Aviation Airport, Port of Fort Pierce, Port of Panama City, and the Panama City Airport.
Publications and Presentations
Drones: A Florida Perspective, Florida Engineering Society Journal, March 2017
Numeric Nutrient Criteria in Region 4: Current Progress and Remaining Challenges, presented at the American Bar Association Key Environmental Issues in U.S. Environmental Protection Agency Region 4, March 2015
Cleared for Takeoff: Insights on Economic Development and Land Use Compatibility at Airports, presented at the Florida Planning and Zoning Association Conference, June 2014
Accelerated Wetland Losses in Coastal Watersheds, Journal AWWA, April 2014
The FAA Begins a New Chapter in Hazardous Wildlife Management, Florida Aviation Business Magazine, July 2013
Elimination, Reduction, and Minimization of Impacts, Florida Environmental and Land Use Law Treatise, June 2013
Where Water and Energy Meet, Journal AWWA, May 2013
Secondary and Cumulative Impacts Analysis and the Clean Water Act, Journal American Water Works Association, July 2012
Numeric Nutrient Criteria for Florida, presented at the Local Government Law in Florida Conference, May 2012
Environmental Issues Facing Florida’s Local Government, webinar presented to the Florida City and County Management Association, November 2011
Airport-Community-Environment-Noise Mitigation and More, presented at the Florida Airports Council Conference, July 2011
Top Ten Tips for Quasi-Judicial Hearings, presented at What You Need to Know about Public Records and Open Meetings in Florida, August 2003
Latest Developments and Issues Relating to Florida’s Public Records Law, February 2003
The Freedom of Information Act 5.U.S.C. 552, as Amended by Public Law No, 104-231, 110 Stat. 3028, February 2003
Top Ten Tips for a Quasi-Judicial Hearing, the Florida Bar Environmental and Land Use Law Section Reporter, Vol. XIX, No. 5, July 1998
Professional, Civic and Community Involvement
Admitted to the U.S. District Court for the District of Columbia
Admitted to the U.S. District Courts for the Southern and Middle Districts, Florida
Pine Jog Environmental Education Center, Past Board Member and Chair
Chamber of Commerce of the Palm Beaches, Trustee and Chair
The Church of Bethesda-by-the-Sea, Chancellor
Florida Democratic Party Legislative Liaison Committee, Member
The Forum Club of the Palm Beaches, Board Member
Association of Florida Community Developers, Growth, Transportation and Infrastructure Task Force, Member
The Florida Bar: Environmental and Land Use Law Section, Administrative Law Section and City, County and Local Government Law Section, Member
Palm Beach and Collier County Bar Associations, Member
American Bar Association: Section of Environment, Energy and Resources and State and Local Government Law Section, Member
2000 Presidential Rank Review Board, Appointee
Naples Regional Urban Design Assistance Team (R/UDAT) Citizen's Task Force, Committee on Environmental Issues, Member, 1987-1988
Awards and Recognitions
Martindale Hubbell AV® Preeminent™ Peer Review Rating
Best Lawyers in America, Environmental Law, 2023-present
Power Leader, South Florida Business Journal, 2023
Listed in Who's Who Legal, Environmental Law, 2010, 2013, 2015
Listed in Chambers and Partners USA Guide, an annual listing of the leading lawyers and law firms in the world, 2008-2009; 2012-2015
Florida Super Lawyers, 2008
Palm Beach Illustrated Magazine Top Lawyer in Environmental Law, 2018, 2020-present; Top Lawyer in Land Use and Zoning Law, 2020-2021; Top Lawyer in Transportation Law, 2021