Good things come in pairs, they say, and nowhere is this more applicable than tech startups. Whether it is Paul Allen and Bill Gates, Steve Jobs and Steve Wozniak, or Larry Page and Sergey Brin, most of the biggest tech companies in the world had at least two founders at the helm.
Creating a company is a creative endeavor, especially in the startup stage when the creativity and drive of the founders can be vital in going up against a larger competitor. The best founding teams feed off each other, not unlike musicians who tend to work better in tandem. It makes sense from a business perspective as well: one founder handles the technical side, the other the business and marketing parts.