Working group report on environments [program environments]. - James Myers; John Callahan (WETICE, 1995)

Software project management and measurement on the World-Wide-Web (WWW). - John Callahan; Sudhaka Ramakrishnan (WETICE, 1996)

Experience in Developing System Requirements Specification for a Sensor Failure Detection and Identification Scheme. - Diego Del Gobbo; Marcello R. Napolitano; John Callahan; Bojan Cukic (HASE, 1998)

Moving Toward Effortless Networking. - John Callahan (Computer, 1998)

Rules about XML in XML. - Tuanjie Tong; Go Eguchi; Jaehoon Cheon; John Callahan; Laurence L. Leff (Expert Syst. Appl., 2006)

The Horcrux Protocol: A Method for Decentralized Biometric-based Self-sovereign Identity. - Asem Othman; John Callahan (IJCNN, 2018)

The Horcrux Protocol: A Distributed Mobile Biometric Self-sovereign Identity Protocol. - Asem Othman; John Callahan (Selfie Biometrics, 2019)

Using Biometrics to Fight Credential Fraud. - Daniel Hardman; Lovesh Harchandani; Asem Othman; John Callahan (IEEE Commun. Stand. Mag., 2019)

IT Pro Special Issue on Communications Recovery and Resilience - Editor's Column. - Tim Weil 001; Bhuvan Unhelkar; John Callahan; Jason W. Rupe; Keith Sherringham (IT Prof., 2020)