Entered computer field in 1963 as IBM Customer Engineer.Systems analysis, design, & programming since 1964, including design & implementation of real-time systems, operating systems, data base management systems, computer simulation systems, compilers & interpreters, computer networking, laboratory & industrial automation.Independent systems consultant since 1972 to large & small firms, governments, & universities, in North America, Europe, Asia, Africa, & Australia. Consulting activities include EA & IT audits & enterprise data base design.Founded Pennington Systems Inc. in 1977 to develop & market systems software products & services (became XTRAN, LLC in 2013). Designed, created, & documented XTRAN, an expert system for rule-driven symbolic manipulation of computer languages, including analysis, translation, & re-engineering of 2nd through 4th generation languages, XML, HTML, & proprietary / scripting / data base / special-purpose languages, as well as data & text. We license XTRAN to users, & also use it ourselves to provide software engineering / data / text automation services.Wharton Business School (University of Pennsylvania) faculty from 1981 (Lecturer) to 1994 (Adjunct Associate Professor), in Decision Sciences department. Taught many undergraduate & graduate courses at Wharton, including honors courses & advanced seminars in programming & software engineering, data base design & implementation, & information systems. Originated & designed several courses.Expert witness, with report, deposition, & court testimony experience, in legal cases involving Enterprise & IT Architecture, software development & engineering, forensic analysis of code / data / text, Intellectual Property issues involving software, and contractual fulfillment / performance failure issues involving software.Magazine & journal articles published in professional media.Panelist & speaker at conferences, workshops, & seminars in North America, Europe, Asia, & Africa.