I've found the author of Voynich manuscript. He was Giovanni Aurispa.

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Although I am dubious about the way Rustandi came to this conclusion, a figure like Giovanni Aurispa is certainly a possible candidate for the "translation" of the VMS. There will have been other, unknown travelers who ensured a lively "import" of works of antiquity to Europe (early Renaissance). Aurispa is merely one of the well-known humanists with an extensive catalog of works. Translation work (whatever it may have looked like) was also carried out by others.

Here is an article on Giovanni Aurispa in Constantinople ( translated from German ):

  Aurispa en.pdf (Size: 221.37 KB / Downloads: 61)