Tiffany Kosel, 28

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When Miami agency Crispin Porter & Bogusky hired Tiffany Kosel, some had doubts that a young art director fresh out of school could keep up with her new partner, Scott Linnen, VP-associate creative director. "But after a few days of seeing her work get approved," says Mr. Linnen, "suddenly no one was second-guessing."

Today, the two are so close they sign their name "Scottiffany."

Ms. Kosel's client roster at MDC -backed Crispin is as high profile as it gets. In less than a year, she's worked on solutions for Ikea, Virgin Atlantic Airways and BMW Mini Cooper. She's also collected two One Show pencils for work on the American Legacy Foundation.

This kind of productivity leaves little room for non-essentials-like sleep. "I'm good with 5 hours," says the 28-year-old, "and when I'm not sleeping, I'm working."