Jack Black is an American actor, comedian, and musician. With his friend Kyle Gass, he makes up one half of the comedy and heavy metal music duo Tenacious D. The group has two albums and a full-length film. His acting career is extensive, starring primarily as bumbling, cocky, but internally self-conscious outsiders in comedy films. He is a member of the Frat Pack, a group of comedians who have appeared together in several Hollywood films, and has been nominated for a Golden Globe award.

Born August 28, 1969, his primary personality traits are represented by the Chinese Zodiac elemental animal sign, the Earth Rooster. The Earth Rooster is much less flamboyant than the rest of the species, but that is more than made up for by their exceptional practicality, reliability and attention to detail. He is a builder who builds to last. He leads by example and often bury himself in his work. As with most Roosters, he can be a biting critic. And, with his keen powers of observation and organized methodology, he will find lots to criticize.