. >>> from being fired to being on fire, up next the ceo brian o'kelly had a major setback that led him to his own billion-dollar setup. he lets customers buy and sell ad space in realtime. how did he bounce back from his pink slip and what can you do to replicate his success? brian is joining us with his career lessons. brooi brian, thank you so much for being here. >> thank you for having me. >> let's talk about your company, it recently hit a billion dollars. it is amazing when you consider that it is profitable compared to what a lot of start-ups see, why do you think that is? and why is it so successful? >> the idea behind appnexus is advertising is the lifeblood of the internet. so many of the internet properties are funded by advertising. so we think that making contents more valuable makes the internet a better place. and so what i invented about ten years ago was the ability to have an auction for every ad, so in the blink of an eye before the website actually loads, we auction the ad off to the highest bidder across hundreds of millions of advertisers. and it makes the content