"Hoover was hardworking, incorruptible, self-assured and self-reliant. But he was also aloof, shy, wary of crowds, awkward at superficial social relations, and extremely sensitive to criticism. "It was," biographer David Burner has written, "perhaps the private man's shrinkage from rough political contact, the predilection for working by himself, and the habit of perceiving problems as requiring rational, impersonal solutions that made Hoover uncomfortable with the rude, demanding Congress as well as with the press." Hoover was often curt with subordinates. A model of efficiency himself, he expected the same of others. Characteristically, he concentrated on detail rather than on the broader significance of a problem. He was a dull speaker, rarely lifting his eyes from the prepared text."