Callistus Onwuka is the founder and owner of Cal Digital And Logistics LLC, a Washington, D.C. and Texas-based federal cybersecurity consulting firm dedicated to delivering mission-ready security solutions for government agencies, defense contractors, and small businesses operating in the federal supply chain.

With over 5 years of hands-on experience in cybersecurity, Callistus has built a reputation for translating complex federal compliance frameworks — including CMMC, FedRAMP, and NIST SP 800-171 — into actionable, cost-effective security programs that protect sensitive government data and ensure contract eligibility.

His expertise spans the full spectrum of federal cybersecurity: from conducting rigorous risk assessments and penetration testing to architecting zero-trust security environments and guiding organizations through the FedRAMP authorization process. Callistus has supported defense contractors and small businesses in achieving and maintaining compliance with demanding government security standards.

Driven by a commitment to national security and digital resilience, Callistus founded Cal Digital And Logistics LLC to bridge the gap between complex federal requirements and practical implementation — ensuring that every client, regardless of size, has access to the same caliber of cybersecurity expertise that protects the nation's most critical systems.