en.wikipedia.org/wiki/Dune:_The_Butlerian_Jihad

This appears to be a factual naming error in the plot summary. Reliable sources describing Dune: The Butlerian Jihad identify the inventor character as Tio Holtzman.

• Google Books' description of the novel names him "Tio Holtzman" and describes him as "the scientist struggling to devise a weapon that will help the human cause."
• Kirkus's review of the same novel likewise says, "On Rossak, inventor Tio Holtzman broods over foldspace technology and personal shields."

Because the article's plot summary says "Holtzmann's experiments," it misspells the character's surname by adding an extra n. The possessive form should be Holtzman's experiments.