Founder of Icahn Enterprises, a big investment firm. Made his name as a corporate raider in the 1980s. At 90, he remains active, recently bidding for Caesars Entertainment, a casino operator. Mr Icahn is among the ultra-wealthy New Yorkers who have decamped from New York to Florida.
Probably the last man who knew how it worked had been tortured to death years before. Or as soon as it was installed. Killing the creator was a traditional method of patent protection.