Mr. Guida, the founding principal of the firm, has practiced environmental law since 1979, when he received his law degree from the University of Virginia School of Law. He has a diversified, national environmental law practice covering air and water quality control, solid and hazardous waste management issues, toxic substances, and state and federal Superfund (CERCLA) matters. He has represented clients in a vast array of industrial and commercial settings. Mr. Guida also was a founder and the first Chairman of the Environmental Law Section of the Dallas Bar Association.

Mr. Guida received his law degree, as well as master's and undergraduate degrees, from the University of Virginia, where he was elected to Phi Beta Kappa. He is admitted to the Bar in Texas, the District of Columbia, and Ohio (inactive), and also is admitted to practice before the United States Courts of Appeals for the Fifth, Tenth, and District of Columbia Circuits, the United States District Courts for the Northern, Eastern and Southern Districts of Texas, and the United States District Court for the Southern District of Ohio. Other past or present memberships include the City of Dallas Environmental Health Commission (1983-1987), the Dallas County Local Emergency Planning Committee (past member), the Environmental Law Section of the Dallas Bar Association (Chair, 1982-1983), Dallas Bar Foundation, Texas Bar Foundation, the Environmental and Natural Resources Law Section of the State Bar of Texas (Executive Council, 1986-88), Environment, Energy, and Resources Section of the American Bar Association, and the District of Columbia Bar.

Mr. Guida has published numerous articles, including "Commandeering State Government: Renewed Confusion Over Federal Power Under the Clean Air Act," 10 Ecol.L.Q. 579 (1983); “Dramatic Growth in Citizen Suits Under the Federal Clean Water Act,” 7 National Law Journal 24 (1984); "Corrective Action Under The Resource Conservation And Recovery Act," 44 Sw L.J. 1331 (1991); "Lost Elephant: The RCRA Corrective Action Program," 1 Journal of Environmental Permitting 125 (1992); and “Enviroterrorism: Long-Term Legal Challenges," 13 Environmental Protection 24 (2002). He served as a Lecturer in Environmental Law at Southern Methodist University School of Law and has frequently spoken at various continuing legal education programs. Mr. Guida also previously served as Editor-in-Chief of Environmental Regulation and Permitting (John Wiley & Sons, Inc.) (1993-1997).

He is rated AV by Martindale Hubbell.