Our Team

Frank Trammer

Founder and CEO

Frank Trammer is a dynamic and influential speaker, trainer, and coach in the areas of leadership and personal development. In 2018, Frank founded Guardian Leadership whose mission is to inspire, challenge and equip others to lead with purpose, achieve their fullest potential, and enrich the lives of those they serve.

Frank has a passion for leadership and building a world of great leaders who are committed to improving themselves, their organizations, and the lives of those they lead. He has helped hundreds of public safety agencies and thousands of leaders at all levels, transform their lives, their careers, and their organizations through his motivational style of leadership training.

Frank serves as an Executive Director for the John Maxwell Team, one of the largest and most trusted training and development organizations in the world. He has also served as an adjunct professor at the Georgia Institute of Technology and Columbus State University where he taught leadership. In addition to his leadership experience, Frank has a diverse public-safety background, having worked more than 20 years in state, county, and municipal law enforcement. Currently Frank serves as the Chief of Police for the newly created Stockbridge Police Department.

David T. Snively, Ph.D.

Instructor and COO

Dr. David T. Snively has dedicated his career to public safety since 2007, starting as a 911 dispatcher and rising through the ranks to serve as Interim Chief of Police.  He has served in diverse roles including Patrol, Criminal Investigations, Traffic and DUI Enforcement, Recruiting, Accreditation, Media Relations, and Training.  His extensive certifications include Internal Affairs Investigator, Master Public Information Officer, Use of Force Analyst, and Master Instructor. Since 2023, Dr. Snively has worked for a Washington, D.C. area nonprofit where he oversees a portfolio of policing research that supports the development of evidence-based practices and model policies.

In addition to his leadership roles, Dr. Snively is an Affiliate Instructor of Criminology and Criminal Justice at Georgia State University in Atlanta, Georgia.  His research focuses on police training and education requirements, as well as diversity, representation, and equity in policing.  He is a National Institute of Justice LEADS Scholar and a Doctoral Fellow of the Academy of Justice Sciences, and he was named the 2016 Master’s Scholar of the Year by Kennesaw State University.

Dr. Snively is a graduate of Northwestern University’s School of Police Staff and Command, the Police Executive Research Forum’s Senior Management Institute for Police, and Georgia’s Chief Executives Training course.  He has completed over 3,500 hours of professional development and continues to serve as a sworn reserve officer in metro-Atlanta.

Trent Lindgren

Lead Instructor

Trent Lindgren is a trainer and facilitator with the John Maxwell Team and a lead instructor with Guardian Leadership. Trent has over 25 years of combined military and law enforcement experience, having served 8 years in the U.S. Army as a cavalry scout and 17 years in law enforcement. He became a police officer after the terrorist attacks of September 11th, 2001, beginning his law enforcement career with the Atlanta Police Department. Trent worked his way through the ranks of Uniform Patrol, K-9, and Traffic Enforcement before being promoted to his current role as Major of Operations with the Alpharetta Department of Public Safety. Trent earned a bachelor’s degree in Communication from Kennesaw State University and a Master’s Degree in Public Administration from Columbus State University. He is also a graduate of the Northwestern University School of Police Staff and Command and the Georgia Law Enforcement Command College Professional Management Program. Trent is a member of the International Association of Chiefs of Police (IACP), Georgia Association of Chiefs of Police (GACP), and is a Georgia P.O.S.T. certified instructor. When he’s not reading about leadership, Trent spends his free time volunteering as a baseball, basketball, and softball coach and training Jiu Jitsu.

Mike Register

Instructor

Mike Register is the Assistant Chief Deputy for the Cobb County Sheriff’s Office. Formerly, Mike was the Director of Public Safety for Cobb County where he managed over 1200 personnel and a $170 million dollar budget. Mike has over 30 years of law enforcement experience. He has served as the Chief of Police for the Cobb County Police Department and the Clayton County Police Department. During his tenure as Police Chief, he introduced many innovative community-oriented policing concepts and initiatives which helped to strengthen community partnerships and enhance public safety. Before his tenure as Chief with Cobb and Clayton Counties, Mike managed an operational, intelligence and law enforcement centric program at the Pentagon in Washington D.C. The program was responsible for locating and identifying individuals, as well as criminal and terrorist organizations globally that facilitated, funded, or used improvised explosive devices (IEDs) to threaten the security and stability of the United States and its partners. He has assisted in advising U.S. government, partner nation military units, and law enforcement organizations, such as the Canadian military and the New York Police Department in counter-IED and terrorism related subjects. Mike also served 22 years in the U.S. Army Special Operations community, where he was a member of the 11th and 20th Special Forces Group and deployed to numerous countries, to include combat operations in Afghanistan, where he served on a Special Forces mobile recon element.

Mike holds a master’s degree in public administration from Columbus State University and is also a graduate of the Georgia Law Enforcement Command College, where he is currently an adjunct instructor. He is currently seeking a Doctorate in Public Policy and Administration with a concentration in Terrorism and Conflict Analysis and Resolution. Mike is a member of the Phi Kappa Phi Honor Society. He has attended Northwestern University’s prestigious Command and Staff program for Law Enforcement executives, and has also served as a member of the FBI’s Joint Terrorism Executive Board and the Georgia Association of Chiefs of Police Legislative Committee as Co-Chair, and is also a Safe America Board member.

Dr. John Robison

Instructor

John serves as the Chairman of the Legislative Committee for the Georgia Association of Chiefs of Police (GACP) and represents District 11 within the organization. He is also a member of the instructor staff for the GACP New Chief’s School. In addition to his work with GACP, John is a professor at both Georgia State University and Reinhardt University, where he shares his extensive knowledge of leadership and public safety.
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With a deep passion for leadership development, John has spent years studying effective leadership strategies in both law enforcement and the private sector. As a Public Safety Chief, his leadership philosophy centers on transformational leadership – an approach that emphasizes inspiring others, fostering a sense of value among team members, and creating a purpose-driven organizational culture.
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John firmly believes that great leadership is about those you lead. His experience and research continue to reinforce the value of putting people first, which benefits both individuals and the organization as a whole. His dedication to this philosophy led him to author Compelling Force Leadership: How Leaders Can Use Their Influence to Effectively Lead People with Purpose and Passion – a guide for leaders seeking to elevate their influence and impact through authentic, purpose-driven leadership.