How Brent Saunders’ Allergan experiment failed

Four years ago, Saunders was the whiz kid of the pharmaceutical set. At 44, he had created a large pharmaceutical firm, then called Actavis, almost by force of will after engineering more than $100 million in deals in a two-year span. Then he had swooped in to rescue Botox maker Allergan from the nefarious claws of Valeant Pharmaceuticals, an asset-stripping drug company loved by many on Wall Street but no one with a conscience.