Life in the advertising agency business is addictive. At any given moment you're either flying high after getting a new client or in the depths of despair after losing one. An ad agency principal spends 30% of his or her time trying to keep clients happy, 30% chasing new accounts and 40% attempting to stop creative people from killing each other.These were some principles Jesse Beau Horton learned from his dad Beau Lee Horton - known in the south...