David Koch, the industrialist and libertarian who used his fortune to transform American politics while also donating more than $1 billion to philanthropic causes, has died. He was 79.

BLOOMBERG - Billionaire David Koch is stepping down from leadership positions in his family’s business and conservative political empire because of deteriorating health, his older brother told company employees in a letter Tuesday.

INVESTOPEDIA - All of Fred Koch's four sons have become billionaires as a result of the unprecedented growth of the family business. In fact, according to Forbes' real-time net worth estimator, Charles and David Koch alone have a combined net worth of $96.6 billion as of November 2017. The two brothers are the only members of the family's second generation who still play an active role in the management of the company.

INVESTOPEDIA - The Koch brothers have become well-known for their libertarian and conservative politics, and are often portrayed as significant personalities that impact elections and government decisions.

NEO - The Koch Brothers emerged stronger than ever, along with a slew of smaller oil tycoons, who lack the kind of longstanding and entrenched influence wielded by the Rockefeller dynasty.

PRNEWSWIRE - Charles and David Koch of Kansas are the wealthiest individuals in America's oil and gas sector, with a combined net worth of US$83 billion, according to a Wealth-X Top 10 list that includes billionaires from Texas, New York and Oklahoma.

FORBES - Человек, который, по оценке Forbes, входит в число 50 самых влиятельных людей в мире, топ-20 самых богатых и, пожалуй, в дюжину самых ненавидимых людей на планете, постоянно рефлексирует. Однако, учитывая, что Чарльзу Коху исполнилось 77 лет, это простительно. Простительно потому, что недавно он назвал президентские выборы «виной всех войн», и потому, что Koch Industries является второй крупнейшей частной компанией в Америке (после Cargill) с выручкой $115 млрд.