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The professions of Esperanto lexicographers vary widely ; one may find teachers ( Atanas D. Atanasov , Paul Bennemann , Émile Grosjean-Maupin , Boris Kolker , etc. ) , theologians like Jan Filip , literary professionals such as Gaston Waringhien , translators ( Fernando de Diego ) or journalists ( Joseph Rhodes , Razen Manandhar ) , but also many technicians and engineers ( Rüdiger Eichholz , Ottó Haszpra , etc. ) Both André Albault and L.L. Zamenhof were ophthalmologist s , while Montagu C. Butler was a musician .
 Boris Kolker, Gaston Waringhien, Fernando de Diego, Joseph Rhodes, Rüdiger Eichholz, L.L. Zamenhof, Montagu C. Butler
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
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Answer:
 Boris Kolker, Gaston Waringhien, Fernando de Diego, Joseph Rhodes, Rüdiger Eichholz, L.L. Zamenhof, Montagu C. Butler