Memoirs of actors, editors and producers indicate that Guillermin was a difficult man to work with. He is described in Norma Barzman's book where he is mentioned in connection with the shooting of The Blue Max (1966) as having a "cold, stiff-lipped manner." Elmo Williams, Producer of The Blue Max, described Guillermin as a "demanding Director, indifferent to people getting hurt as long as he got realistic action . . . he was a hard-working, overly critical man whom the crew disliked. However, Guillermin was a master at camera setup."