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Bill Quirk is the president and director of training for the Defensive Training Group (DTG) and the Range Master and Lead Instructor for Shoot GTR. Mr. Quirk is an honorably retired veteran of a mid-sized law enforcement agency in north central Florida with over 20 years of service.
During his law enforcement career, Mr. Quirk served eight years as a uniformed patrol officer prior to being transferred to Investigations. For the last nine years of his career, Mr. Quirk was permanently assigned as a full-time investigator and instructor with the US Marshals Florida/ Caribbean Regional Fugitive Task Force. He has served as the lead instructor for his agency's active shooter response team and has been certified as a firearms instructor by the State of Florida Criminal Justice Standards and Training Commission. He holds credentials as an NRA Law Enforcement (LEAD) Patrol Rifle Instructor and with the USCCA as an instructor in Defensive Pistol, Concealed Carry and Home Defense, and Carbine. He has served as an adjunct instructor for Morrigan Consulting and Sentinel Concepts. Mr. Quirk has attended countless schools over the past three decades, including instructor and operator courses from:
He holds the rank of Shodan (First Degree Black Belt) in Jiyushinkai Aikibudo. He has instructed the use of and developed curriculum for the tactical deployment of firearms for local, state, and federal law enforcement, for the military, and for citizens interested in lawful self-defense. |
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Robert Balbis is an adjunct instructor for the Defensive Training Group, specializing in tactical medicine. Dr. Balbis is a full time medical doctor and a former combat medic with the US Army 82nd Airborne Division, with combat deployments during Desert Storm.
Dr. Balbis served in the US Army from 1989 to 1997, and graduated from Michigan State University College of Osteopathic Medicine in 2001. He is a TCCC (Tactical Care of the Combat Casualty) instructor as well as being certified in wilderness medicine. Dr. Balbis joined DTG in 2018. |
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Stephen Roberts is an experienced firearms instructor with a solid background in the private security sector of a Multi-State Security Company. Serving five years as a patrol officer and supervisor, Stephen gained invaluable hands-on experience in being a first responder, developed strong team leadership, and played a key role in ensuring the safety of clients and assets in dynamic environments.
Stephen specializes in teaching individuals how to effectively handle and operate a multitude of platforms, combining his experience with proven teaching methods. His expertise covers everything from firearm safety and marksmanship to tactical gear and equipment. He is passionate about empowering his students to approach firearms training with both responsibility and competence, ensuring they are prepared for both professional and personal defensive contexts. Stephen’s dedication to the craft is constantly demonstrated as he continues to refine his skills and share his wealth of knowledge with others. Stephen joined DTG in 2025. Stephen has attended classes and holds certifications from multiple organizations including:
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