Pritzker was the son of Ukrainian Jewish immigrants Annie P. (née Cohn) and Nicholas J.
[6] In the 1930s, he left the law practice and branched out with his brother Abram investing in real estate and small companies mostly in the Chicago area.
[8] His nephew Robert created a conglomerate of a multitude of manufacturing companies which grew into the multibillion-dollar Marmon Group.
Marmon was diversified to include manufacturing concerns ranging from lumber to railroad box cars and travel industry staples.
On December 25, 2007, it was announced that Warren Buffett, through Berkshire Hathaway, would purchase 60% of the Marmon Group from the Pritzkers for $4.5 Billion.