John G. Tamasitis

John Tamasitis is an experienced trial lawyer and litigator who has represented corporate and individual clients in state and federal trial and appellate courts throughout South Carolina and nationwide in a variety of complex commercial litigation matters. These matters include products liability defense, defective product claims, mass torts and multidistrict litigation (MDL), white collar criminal defense and government investigations, insurance coverage disputes and bad faith litigation, business contract disputes, breach of contract claims, zoning and land use disputes involving constitutional claims, and environmental litigation including PFAS and forever chemicals contamination cases.

John is a former federal law enforcement agent and United States Air Force officer who has extensive experience guiding corporate clients in a variety of matters involving commercial contract disputes, product liability defense and recall matters, environmental compliance and contamination litigation, and both state and federal constitutional law challenges. John is also a key member of Williams Mullen’s firearms industry practice group, which represents members of the firearms and ammunition industry, including gun manufacturers, firearms retailers, FFLs (federal firearms licensees), gun dealers, shooting ranges, and government defense contractors.

John is focused on assisting clients throughout every phase of the litigation process, from pre-litigation risk assessment and early case evaluation through settlement negotiations, mediation, arbitration, jury trials, bench trials, and appeals to the South Carolina Supreme Court and the United States Court of Appeals for the Fourth Circuit. His approach combines aggressive advocacy with cost-effective litigation strategies tailored to each client’s business objectives.

Prior to practicing law, John served as a captain in the United States Air Force with the Office of Special Investigations (OSI). While deployed, John led counterintelligence and counterinsurgency teams in Afghanistan in 2008 and 2009 and was awarded the Bronze Star Medal for his distinguished service in and around Bagram Airfield. Back in the United States, John operated as a counterintelligence agent and was the appointed branch chief for two Air Force bases in Northwest Florida until heading off to law school in late 2011. In that role, John led and directed a team responsible for counterintelligence and anti-terrorism investigations in the region. He also provided research and technology counterintelligence protection services with the FBI and other federal government agencies to the Air Force's Special Operations Command Headquarters and the Air Force Research Laboratory Munitions Directorate, which conducts research and development for the Air Force's air-launched munitions and explosives program. John’s military intelligence background and security clearance experience provide him with unique insight into government investigations, regulatory compliance, and national security matters.

John is an active participant in his community, serving as a founding member and president of Midlands Junior Golf Foundation, an active parishioner at St. Joseph’s Catholic Church in Columbia, and a youth girls’ basketball coach for the St. Joseph’s Catholic School.

John earned his Bachelor of Science degree from the U.S. Air Force Academy where he was the class president and a cadet squadron commander. John received his law degree from the University of South Carolina School of Law, magna cum laude, where he was both a member of the Order of the Coif and the Order of the Wig and Robe. John also served as the Fourth Circuit Editor of the South Carolina Law Review.