Background
Callahan, John Raymond was born on December 27, 1962 in Alexandria, Virginia, United States. Son of Donald Paul and Mary Louise Callahan.
Callahan, John Raymond was born on December 27, 1962 in Alexandria, Virginia, United States. Son of Donald Paul and Mary Louise Callahan.
Bachelor of Science, University Maryland, 1985. Master of Science, University Maryland, 1987. Doctor of Philosophy, University Maryland, 1993.
Intern Xerox Corporation, Palo Alto, California, 1985, consultant Tysons Corner, Virginia, 1985-1988. Professor computer science West Virginia University, Morgantown, since 1992. Director Globalcast Communications Corporation, Hayward, California, since 1994.
Chief scientist National Aeronautics and Space Administration Indiana Verification and Validation Facility, Fairmont, West Virginia, since 1994.
Member Association Computing Machinery.
Married Patricia Marie Zach, January 12, 1991.