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Ralf Blunden was a known murderer nicknamed "the Professor" who regularly worked with Heimo Kantor and Little Yaxa. They were killed by Geralt outside an inn in Anchor while tracking Ciri and Yennefer. He wore gold-framed glasses with bluish-coloured crystal lenses and was the leader of the group. His nickname was mostly likely ironic as he was known for using words and phrases that he did not seem to entirely comprehend.

'Fancy a drop, Professor?' 'With the utmost pleasure,' responded the other man, straightening a pair of gold-framed glasses made of bluish-coloured crystal, which were perched on his hooked nose.
— pg(s). 40, Time of Contempt (UK edition)

In The Witcher computer game[]

He is not to be confused with "the Professor" in the game, who is known as "magister" in the Polish version. These are not the same character at all.