Defensive Training Group
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Bill Quirk is the president and director of training for the Defensive Training Group (DTG). Mr. Quirk is an honorably retired 20 year veteran of a mid-sized law enforcement agency in north central Florida. 

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 has served as an adjunct instructor for Morrigan Consulting and Sentinel Concepts.

Mr. Quirk has attended countless schools over the past decade, including instructor and operator courses from:
  • State of Florida
  • Safariland
  • Florida Counter Drug Training Academy
  • NRA LEAD
  • Morrigan Consulting
  • Magpul Dynamics
  • Vicker's Tactical
  • Trident Concepts
  • Costa Ludus
  • Sentinel Concepts
  • System of Strategy
  • SIG Sauer Academy
  • United States Marshals Service

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.

Dean White is the Director of Tactical Medicine and an adjunct instructor for the Defensive Training Group.  Dr. White is a full time medical doctor as well as a former reserve officer with a mid size law enforcement agency in North Central Florida.  

Dr. White served as a paramedic from 1991 to 1997, before receiving his MD degree in 2000.  He has trained with and assisted DTG since 2011.  He is a certified NRA pistol instructor.  

He has attended training courses from:
  • Sentinel Concepts
  • Costa Ludus
  • Trident Concepts
  • Vicker's Tactical
  • Magpul Dynamics
  • Morrigan Consulting
  • NRA
  • System of Strategy
  • State of Florida
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Maggie Martin is an adjunct instructor for the Defensive Training Group.  She is currently the advertising director for a Gainesville-based advertising firm.

Ms. Martin began her training journey as a student with DTG in 2017, and has been actively teaching with DTG since January 2019.  She is certified as an NRA Pistol Instructor.

She has attended training courses from:
  • NRA
  • Tatiana Whitlock
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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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