Mark is an independent programmer, award-winning author, and trainer. Mark is a qualified teacher and graduated with first class honours in Computer Science from the University of Wales Swansea, UK. Prior to starting Qtrac Ltd., he spent many years in the software industry, primarily as a programmer. He owned and ran Qtrac Ltd. for 19 years until its demise in 2025. He continues to write free open source software (mainly small utilities and libraries), and is a contributer to a variety of other people's free open source software projects.
See the Site Map for Mark's commercial software (no longer on sale), and his open source software, books, and short-form technical writing.
Mark's interests include the long defunct Personal Computer World magazine and more generally the history of personal computing in the C20th, as well as programming languages.
Mark uses the Commit Mono font for coding and for terminals. For typesetting and diagrams Mark uses the Lout Typesetting System, although nowadays he sometimes uses asciidoctor or commonmark markdown.
By email Mark can be contacted as m.n.summerfield (gmail—dot com).
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