Born 1894, died 1969
A renowned botanist at the Catholic University of America. In 1944 he identified various plants depicted in the Voynich Manuscript as New-World species. However the voyages of Christopher Columbus were somewhat after the time to which the VM has been dated (and the Viking exploration of Vinland occurred too long before the manuscript's creaion.)
The article on JSTOR is here .
Wikipedia's list of persons of the same name is at .