You’ll have to boast a particularly robust bank account to nab billionaire Bill Koch’s newly listed wintry ... venue on the ...

Billionaire energy mogul Bill Koch is looking to cash in on Aspen ... He also owns a 4,500-acre Colorado ranch featuring a 75 ...

Billionaire Bill Koch has listed his 52-acre Aspen retreat for sale for $125 million. The Elk Mountain Lodge property hit the ...

TOPEKA, Kan. (AP) — Bill Koch won the America’s Cup, formed a commission to study criminal justice issues — and sued two of his brothers. He was expected to be the star witness during the third week ...