Cook started diving at the age of four; her sister, Kara, was a diver at Purdue University.

Kassidy Cook graduated from The Woodlands High School in 2013 and from Stanford University in 2018.

[2] She and Sarah Bacon, her best friend and diving partner, qualified for the 2024 Paris Olympics in the 3 meter synchronized springboard event for the United States.

[3][4][5] On July 27, 2024, Cook and Bacon won the first medals for the United States at the 2024 Olympics, silver in the 3 meter synchronized springboard event.

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