Stephen F. Heffner

President, XTRAN, LLC
Casa Grande, AZ, USA

Software inventor / architect / designer / implementer, entrepreneur, educator, expert witness

Entered computer field in 1963 as IBM Customer Engineer. Systems analysis, design, and programming since 1964. Independent systems consultant since 1972; clients include large and small firms, governments, and universities, in N. America, Europe, Asia, Africa, and Australia.
Consulting activities include IT audits and corporate database design. Expert witness in legal cases involving computer software.
Systems programming activities include design and implementation of real-time systems, operating systems, database management systems, computer simulation systems, compilers and interpreters, computer networking, laboratory and industrial automation.
Founded Pennington Systems Incorporated in 1977 to develop and market systems software products and services. Pennington was superseded in 2013 by XTRAN, LLC. Designed, implemented, and documented many of XTRAN, LLC's software products, including XTRAN, an expert system for rule-driven symbolic manipulation of computer languages such as analysis, translation, and re-engineering of second through fourth generation computer languages, markup languages, scripting languages, and database languages.
Wharton Business School (University of Pennsylvania) faculty member for 13 years, from 1981 (Lecturer) to 1994 (Adjunct Associate Professor), in the Decision Sciences department. Taught many undergraduate and graduate courses at Wharton, including honors courses and advanced seminars in programming and software engineering, database design and implementation, and information systems. Originated and designed several courses.
Member, Association of Computing Machinery and IEEE Computer Section since 1975; Past Chairman of Princeton, New Jersey ACM chapter and of local Special Interest Group for Programming Languages (SIGPLAN).
Published magazine and journal articles in the professional media. Participant in international, national, and regional conferences, workshops, and seminars, including presentations in North America, Europe, Asia, and Africa.