Professor of Medieval Philosophy at Yale, who was in a position to look at the original document of the Voynich Manuscript, at a time when there were few photocopies and facsimiles in circulation.
President of the Metaphysical Society of America 1966-7: his Presidential address was "Applied Metaphysics: Truth and Passing Time".
Published a series of articles on the Manuscript in the 1970s, in which he proposed a transliteration.
An article by him here [1]. Some information on the German Wikipedia page on the Voynich Manuscript [2].
His book 'The Philosophers of Greece' can be found here.