John Callahan






Chief Technology Officer


New York, NY, USA


LinkedIn Profile

Summary of Experience

Dr. John Callahan is Chief Technology Officer (CTO) at Veridium, a leading biometric authentication company. Dr. Callahan recently served as the Associate Director for Information Dominance at the US Navy’s Office of Naval Research Global (ONRG) London UK office from 2010-2014 via an Intergovernmental Personnel Act (IPA) assignment from the Johns Hopkins University Applied Physics Laboratory (JHUAPL) in Laurel, Maryland USA. From 2000-2006, Dr. Callahan served as VP of Engineering and CTO of BDMetrics, Inc. and where he managed social networking systems for the world’s largest trade shows such as the Consumer Electronics Show (CES), PackExpo, and National Association of Broadcasters (NAB). Prior to 2001, he was a tenured Associate Professor in the Department of Computer Science and Electrical Engineering at West Virginia University (WVU) in Morgantown, WV USA and research director at the NASA Independent verification and Validation (IV&V) Facility in Fairmont, WV USA. He completed his PhD in Computer Science at the University of Maryland, College Park USA. Dr. Callahan has worked for Xerox Corporation in Palo Alto, CA USA, NASA Goddard Space Flight Center in Greenbelt, MD USA, and IBM Corporation.

Domain Experience

Aerospace / Aviation, College/University Professor, Education /Training, Finance / Banking / Insurance, Government / Military / Defense, Healthcare / Medical / Medical Devices, Telecommunications

Use Case Experience

Anti-Money Laundering (AML), Electronic Medical Records, Identity Management, Security

Blockchain Development Experience

Hyperledger Fabric, Other

Cryptocurrency Experience

Bitcoin, Ethereum, Bitcoin Cash

Languages Spoken

English, French, Spanish

Are you open to speaking opportunities?


Availability for Work or Contract Opportunities

Not Available

Available for Travel*


Government Roles

Government Administrator, Civil Servant (Employee), Government Contractor, Other