The device industry is the source of wealth for 10 of the people on Forbes' annual list of the 400 richest people in America. Leading the way is Carl Cook, CEO of Cook Medical, with a net worth of $6.6 billion. Three members of the Stryker ($SYK) family are on the list a well. So is Hansjörg Wyss (worth $6.1 billion), who sold Synthes to Johnson & Johnson ($JNJ) in 2012 for $20.2 billion. His daughter also made the list. The diagnostics industry is represented, by Elizabeth Holmes (worth $4.6 billion), who founded blood testing company Theranos with money she saved up during college. Interestingly, the device industry beat its bigger cousin. The pharma industry has 6 representatives on the list. Story | The med tech representatives