He knows practically everyone in Ubud and has a deep knowledge of Balinese history and culture.

BBC: Changing lives and perceptions in Ubud

Like Mr Gates, he has a deep knowledge of military and intelligence affairs, broad bipartisan support and a streak of stubborn independence.

ECONOMIST: Barack Obama��s defence team is taking shape

Jazz bassist Drew Gress has a deep tone and a deep knowledge of harmony, which makes him a good foil for lyrical pianists like Fred Hersch.

NPR: Summing Up Drew Gress' 'Irrational Numbers'