Who We Are

AGB is the largest Black-owned employer in the nation, beginning in the basement of married-preneurs, Dr. Denitra & John Griffin Jr.’s home in 2001. Today, AGB serves Fortune 10 clients, employs over 750+ individuals nationally & has expanded to two, 501c3’s that are dedicated to the communities it serves. AGB was founded on the mission to employ the unemployable and create opportunities for adults and youth through workforce development, life-skill training, internships, and scholarships.

Our Company

AGB Investigative Services, Inc., offers expertise in all aspects of security, including physical and cyber. AGB is an award-winning company that meets the rigorous International Organization for Standardization (ISO) 9001 quality management standards for services. The security professionals at AGB are driven to protect your people, property, and data. We are the only full-service security company in the Midwest that combines state-of-the-art technology with physical security and education. AGB uses these resources to address emerging threats that our clients in the public and private sectors face.

We employ over 750+ full- and part-time security professionals who provide armed and unarmed security services; cybersecurity; private investigations; and expert-level training. Our fully accredited workforce has extensive experience in handling complex and sensitive security and investigative projects. Our security officers are highly qualified to fulfill your security needs with integrity and professionalism.

Download our capabilities statement

Always Giving Back

The Story Behind our Name

AGB means “Always Giving Back.” Our president John Griffin, Jr., grew up in the Englewood neighborhood on Chicago’s South side. His intention was always for our company to be a ministry that assists people in need. Since 2001, AGB has created hundreds of professional opportunities for adults, particularly minorities in underserved areas of Chicago. We also have a foundation that offers business internships and college scholarships to young people.

The AGB Difference

Core Values

Family Oriented

  • Teamwork

  • Empathy

  • Support

  • Respect

  • Commitment

  • Loyalty


  • Giving Back

  • Community Engagement

  • Customer Focus

  • Highest Quality


  • Innovative

  • Professional

  • Hard Work

  • Development

  • Integrity


AGB is highly credentialed in the physical and cyber security fields with numerous certifications from the Federal Government, the State of Illinois and the City of Chicago.

  • ISO 9001:2015 Certified Nationwide
  • Certified Provider of 20- and 40-hour Guard Training State of Illinois
  • Business Enterprise Program (BEP) Certification State of Illinois
  • ASIS International Member
  • 8(a) SBA Certified
  • Minority Business Enterprise (MBE) State of Illinois, City of Chicago
  • Small Disadvantaged Business (SDB) Small Business Administration (SBA)
  • Six Sigma and PMP Certified Executive Team
  • GSA Schedule 84 Contract Holder
  • EnCase Certified Examiner State and Federal Level
  • EEOC Compliant


Our Clients

Our client base includes government agencies from the federal to the local level; multi-family housing, fast food restaurants, retail establishments, and utility companies.

Some Key Clients


  • 561612 Security Guards and Patrol Services
  • 561611 Investigation Services
  • 541690 Security Consulting Services
  • 922120 Police Protection
  • 541512 Information Management/Computer Systems Integration Design
  • 541511 Custom Computer Programming Services
  • 541513 Computer Facilities Management Services
  • 541519 Other Computer Related Services