This month marks Who What Wear's 20th anniversary! To celebrate, we're spending all of October with guests who have left an indelible mark on the fashion-and-beauty world and grown up alongside us over the past two decades.

This week, Hillary is joined by her good friend Jen Atkin, celebrity hairstylist and founder of Ouai and Mane. Even if you're not familiar with Atkin, you've likely heard her name dropped by numerous guests on this show. Atkin has styled some of our favorite It girls' most iconic looks and founded two incredibly successful hair brands. But above all, she has been a champion of and mentor to other artists. Today, she chats all about building her hair empire; the behind-the-scenes details of some of her buzziest celeb looks, from Hailey Bieber to Bella Hadid; and the impact she has had on the hair industry.

Watch this episode on our new YouTube channel, and be sure to subscribe!

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WWW20 Presents: Celebrity Hairstylist and Beauty Founder Jen Atkin on Building Her Hair Empire