Code and Theory is the design firm behind The Verge, Mashable, and Vogue:

Brandon Ralph and Dan Gardner met when they were just kids. Then they ended up working together as designers at DraftFCB. Later, in 2001, they launched Code and Theory, a full-service design and advertising firm.

Since then they've worked with clients ranging from Lenny Kravitz to Dr Pepper to The Daily Beast. And despite the adage against starting businesses with friends, Gardner attributes a big part of their success to just that. 

In 12 years, the two have built a company with more than 175 employees across the U.S. and Asia and have designed websites including The Verge, Mashable, and Vogue.

There's a good video of the founders and their tips for business success:

http://www.businessinsider.com/code-and-theory-founders-tips-for-success-2013-6