Robert S Brumbaugh

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.
Published a series of articles on the Manuscript in the 1970s, in which he proposed a transliteration.
An article by him here . 
His book 'The Philosophers of Greece' can be found here. Details of other books can be found here .
From the German Wikipedia page on the Voynich Manuscript .
Robert Brumbaugh was a professor of medieval philosophy at Yale University, so unlike other Voynich researchers, he had the opportunity to view the original document - at a time when only a few pages were (black and white) facsimiles published or in circulation as a photocopy, an invaluable advantage. In addition, he was awarded a research contract to study the manuscript. He published a number of articles on the subject in the 1970s and summarized in the 1978 monograph The Most Mysterious Manuscriptthe state of research at the time. Brumbaugh himself developed the theory that the Voynich characters are (decimal) digits due to the similarity of some Voynich characters to ancient numerals, with each digit being assigned several letters of the Latin alphabet. Similar to Feely's approach, such an encoding would contain an element of ambiguity, so the decodings contain a highly subjective element. The "decryption" presented by Brumbaugh also made no (obvious) sense.
Category:Biographies
Category:Voynich Manuscript articles
Category:20th century