Koch is worth $44.9 billion, according to Forbes. His fortune comes from Koch Industries, which his father began as a refinery business, making the Kochs into power players in the fossil-fuel industry. The brothers repeatedly opposed efforts to fight climate change.

Koch Industries' PAC and employees gave $2.8 million to Republican candidates in the 2020 cycle and $221,000 to Democratic candidates, according to The Journal.

In an email to Belkin, Koch congratulated President-elect Joe Biden and Vice President-elect Kamala Harris on their victory, saying he looked forward to "finding ways to work with them to break down the barriers holding people back." He cited the economy, criminal justice, and immigration as examples of key issues.

"At the same time," Koch wrote, "I hope we all use this post-election period to find a better way forward. Because of partisanship, we've come to expect too much of politics and too little of ourselves and one another.

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BELOW ARE JUST A SAMPLING OF WHAT KOCH HAS DONE: