Abstract This collection consists of professional and academic works, notes, publications, books, reviews, drafts, papers, class materials, and correspondence produced and collected by Richard L. Tieszen between 1974-2017. Subjects covered include philosophy, phenomenology, intuitionism, logic, mathematics, set theory, and other various topics relating to philosophy, logic, and mathematics. Material formats consist of manuscript notes, printed email correspondence, pamphlets, booklets, news...