This issue of Iranian Studies is Devoted to the Late Medieval Persian Preacher and polymath, Kamal al-Din Husayn b. ᶜAli Vaᶜiz-i Kashifi, and it coincides roughly with the quincentenary of his death in 910/1504–05. It is based on a panel of papers delivered at the Fourth Biennial Conference on Iranian Studies, which was held in Bethesda, Maryland, May 24–26, 2002, under the sponsorship of the Society for Iranian Studies, and co-sponsorship of the Association for the Study of Persianate Societies. It brings together papers on a number of Husayn Kashifi's works with the aim of demonstrating the breadth of his oeuvre, and in particular his contribution to the codification, primarily in Persian, of knowledge in fields covering the entire spectrum of learning in medieval Iran at the turn of the sixteenth century. As such, the volume seeks to “rehabilitate” Kashifi, who has usually been regarded merely as a compiler or popularizer, and to present him as a figure who was instrumental in the preservation and transmission of the state of the art of knowledge in a wide variety of fields in late medieval Iran.