Emily Weiss is the CEO of Glossier, an online beauty company that has found success in selling makeup directly to customers through Instagram, where it has more than 2.1 million followers.
In March, the company raised an additional $100 million in a funding r ound that valued the company at $1.2 billion.
Weiss, who started out as a Teen Vogue intern and briefly appeared in US TV show The Hills, launched the company in 2014, off the back of a successful blog that she launched in 2010.
Weiss, who started out as an intern at Teen Vogue and even made an appearance in the US TV show, The Hills, alongside Lauren Conrad in 2007, has built up a billion-dollar business in five short years.
Here's how she built up the company from scratch: