Our Vision

" Is to provide high quality and professional security and investigation services to our clients throughout Southeast Wisconsin, while valuing every employee and building a great workforce."

Our Mission

"Is to provide professional security and investigative services which detects, deters and report crime of person and property using the latest in technology and training"

Our Core Values

  • Accountability
  • Commitment
  • Courage
  • Diversity
  • Duty


  • Excellent Customer Service
  • Great Work Ethic
  • Professionalism
  • Respect of others
  • Safety and Security

Our Approach

Our Story

Mr. Williams for website 2

Headquartered in Milwaukee Wisconsin, our agency specializes in investigation and security guard services. Whether you're a nonprofit, church, or small business owner, we will not only protect what you have created, we will help it thrive. We bring many years of experience, expertise and highly trained staff to support the individualize needs of our clients.

"We protect what you value"

Licensed since 1993, GT Private Detective Agency, LLC. operated by Gregory T. Williams specializes in private investigation (probate, missing persons, Workmen's Comp, personal injury, and divorce) and security guard services as a single proprietor, GT Private Detective Agency LLC. has worked with many other businesses which include Klitzke & Associates, known for their Data Tracking and Technical Analysis capabilities since the mid 2000's. Registered and licensed through the State of Wisconsin GT Private Detective Agency, LLC. with a staff of 40 plus dedicated professionals, GT has worked to provide private detective and security services for individuals, government agencies, corporations, churches, and community-based organizations.

Mr. Williams holds a master's degree and a doctorate degree and is involved in various social and civic groups focused on positive community development. He has experience as a police officer and as a former federal agent with Naval Criminal Investigative Services (NCIS) where he completed his training through the Federal Law Enforcement Training Center (FLETC) and has over 30 combined years of law enforcement, teaching and program administrative experience.

As a minority DBE, MBE and SBE certified agency, GT Private Detective Agency, LLC. is the contractor of record providing an array of investigative, armed and unarmed security guard services.

GT staff come from various professional backgrounds such as Military and Law enforcement, Customer Service, Education and Healthcare. All of our armed and unarmed guards are licensed through the state of Wisconsin, CPR and First Aid certified, and have quarterly educational training.

Next Steps...

For your free consultation contact us