Liesel Anne Pritzker was born in Chicago, Illinois, into the wealthy Pritzker family, the daughter of Irene (née Dryburgh) and Robert Pritzker. Her father founded The Marmon Group with his brother Jay Pritzker. She is of Jewish origin on her father's side and her mother is Australian. Her mother met her father while working at a Pritzker-owned Hyatt hotel in Australia; they married in 1980 and divorced in 1989. She has one brother, Matthew Pritzker, and three half-siblings from her father's first marriage to Audrey Gilbert Pritzker: Jennifer N. Pritzker; Linda Pritzker; and Karen Pritzker Vlock. She was named after the Sound of Music character Liesl von Trapp, the eldest daughter of the seven von Trapp children She is one of twelve surviving grandchildren of patriarch A.N. Pritzker, a financier and industrialist who died in 1986. Her uncle, Jay Pritzker, is the founder of the Hyatt Hotel chain, and owned Braniff Airlines from 1983–1988. The family controls the TransUnion Credit Bureau and the Royal Caribbean Cruise Lines. The Pritzker family has been near the top of Forbes magazine's "America's richest Families" list since the list began in 1982. Pritzker graduated from New Trier High School outside of Chicago and enrolled at Columbia University.

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