Jack is an engineering project manager at Raytheon Naval and Maritime Integrated Systems and doubles as Advanced Technology Manager for Team Keyport Services (TKS), a joint venture of Raytheon and BAE Systems. TKS was organized in 1999 to provide a broad spectrum of services to Naval Undersea Warfare Center Division Keyport, for whom its member companies (Raytheon, BAE Systems, AMSEC, ARL Penn State, Paladin Data Systems, and a variety of small companies) have been providing engineering services since 1975. Jack's role for TKS is to identify NUWC Keyport's technology support requirements, match them with the capabilities of the TKS member companies, and facilitate issuance of delivery orders under the TKS contract.

Engineering projects that Jack has managed include the AN/SLQ-48 Mine Neutralization System, used effectively in the Gulf War; an audio generator for submarine sonar trainers that includes 96 digital signal processors; a 100-mile long hydrophone array for tracking underwater vehicles; and NUWC Keyport's Range Information Display Center, at which test engineers and program managers can view tests of undersea equipment in real time without traveling to the test site.

Jack's first encounter with a computer involved an IBM 650. As an undergraduate mathematics major at the University of Notre Dame, he did application programming on an IBM 1620 and systems programming on a UNIVAC 1107. After graduate studies at Notre Dame and Gottingen, Jack received his Ph.D. in mathematics from Notre Dame in 1968. He was an assistant professor of mathematics at the University of Washington from 1968 to 1975, after which he joined Honeywell's Marine Systems Division, the predecessor of the Raytheon business for which he now works.

In 1991, Jack published (jointly with his wife Rosemary, then with the University of Puget Sound) the text Introduction to Discrete Mathematics. During 1992-1993, Jack and Rosemary were visiting lecturers at the University of Maryland European Division, where Jack taught courses in database theory, network theory, and processor architecture, and Rosemary taught mathematics and computer science.

Jack is a member of the American Mathematical Society and the IEEE Oceanic Engineering Society.