With James Gillogly, founder of the Voynich Manuscript Mailing List in 1991.
Identified Sloane MS. 8 in the British Library as the Book of Soyga. (The British Library page on Sloane's books is ).
Author of 'William F. Friedman's Transcription of the Voynich Manuscript'. Cryptologia XIX 1995, and 'John Dee and the Magic Tables in the Book of Soyga'.
See here, here and here. (Checked April 2018)