Series III consists of materials relating to Richard L. Tieszen's professional career in the academic and publishing world. He was involved in various groups, organizations, and circles relating to his philosophical, mathematical, and logical interests, and contributed editorial work, referee work, and wrote many articles as well as several books on these topics.

Materials included in this series are correspondences with colleagues/publishers, extensive notes and drafts on various philosophy topics, notes and other ephemera relating to various conferences and presentations attended by Tieszen, articles by and reviews of Tieszen's work, and several drafts of books/articles published and unpublished by Tieszen and colleagues of his. Also includes Tieszen's CV and Development Summary.