The 1979 investigative biography by the Pulitzer-winning Philadelphia Inquirer team of Donald L. Barlett and James B. Steele. Built on thousands of pages of Hughes's internal documents obtained through extensive reporting, Empire is the definitive account of Hughes as an institutional force — not just a colorful eccentric but a man who built a hidden empire of influence that reached into the CIA, the U.S. military, and Las Vegas. It covers the full arc from the inheritance of Hughes Tool through the aviation records, the film career, the aerospace contracts, and the long, sad decline into isolation and madness, with more documented detail on the business machinations than any other biography.
Where the Hack biography gives you Hughes from the inside (his own diaries and letters), Empire gives you Hughes from the outside — the empire he built, the people he controlled, the institutions he penetrated. Barlett and Steele were investigative reporters, not biographers, and their book is correspondingly stronger on the mechanics of power than the psychology of the man. For founders, the value is in seeing how Hughes structured his affairs: the use of the Howard Hughes Medical Institute as a tax shelter that also became a world-class research institution; the systematic bribery and influence operations that let him operate across industries; and the complete absence of institutional succession planning that turned a Fortune 500 empire into a legal battlefield the moment he died.