A major figure in one of Chicago's most powerful families has passed away.
Robert "Bob" Pritzker, 85, died Thursday from Parkinson's disease, the Chicago Tribune reported.
Pritzker built the Marmon Group into a $7 billion business over five decades, and sold it to Warren Buffet's Berkeshire Hathaway in 2008, according to the newspaper.
Forbes estimates Chicago's extended Pritzker family to be worth more than $19 billion.
Over the years, Pritzker taught at his alma mater, the Illinois Institute of Technology and also at the University of Chicago and a visiting professor at Oxford University in England.
He also helped create the Pritzker Institute for Medical Engineering at IIT.
Pritzker is survived by a wife, five children, 10 grandchildren and two great-grandchildren, according to the Tribune.