She is the daughter of dermatologist Neil Sadick and Amy Kamin, former CEO of Endymed, Inc. She attended The Hewitt School from kindergarten through 12th grade.
She earned her bachelor's degree in journalism from the George Washington University's School of Media and Public Affairs.
Sadick's career began when she was just a junior in high school, when she attended Harvard University's summer program.
She was responsible for writing thousands of articles both online and print, and has interviewed some of the most coveted designers and celebrities: Kim Kardashian, David Beckham, The Chainsmokers, Tom Brady, Sofia Vergara, Diane Von Furstenberg, Oscar de la Renta, Heidi Klum, Maria Sharapova, Carrie Underwood, Kylie Jenner, among many others.
She has covered the Met Ball, New York Fashion Week, the CFDA Awards, and more high-profile industry and society events.
Sadick has appeared on the Lifetime show, Project Runway[8] Sydney was named a broadcast spokesperson for Olay's red jar products.
Her clients include: Schutz, De Beers, Rebag, Furla, Ramy Brook, Kendra Scott, Intermix, Cutera, Alice and Olivia, American Express Wardrobe App, among others.