It\u2019s always a big deal when a businessperson steps down from a leadership role of a company they helped build \u2014 particularly if that company bears their name.\nSo it is with Arianna Huffington, co-founder of The Huffington Post. She\u2019s been with the Post for 11 years now but will leave the publication in the coming weeks to focus on the next challenge: her startup Thrive Global.\n\n\u201cI really thought I could do both,\u201d Huffington said, \u201cbut as we started building [Thrive Global] up, I realized that it really needed my full attention. It is important to know when one door closes and another opens.\u201d\n\nThis is a conundrum that was also faced recently by billionaire investor and visionary eccentric Elon Musk, who helped birth SpaceX, SolarCity and Tesla.\nThe latter two companies are now talking about a merger \u2014 a move that would help them move forward together toward a shared goal. Ambitious though it might be, the plan has met with a tepid response from investors and Wall Street in general.\nWhereas Musk seems eager to test his ability to preside over two rather different multibillion-dollar companies, Huffington is going in a completely different direction, and it might be the right choice for the culture of both of her ventures.\nBy choosing not to divide her attention between two major business endeavors, she has effectively ensured that both companies can grow and thrive in their own way, and continue to develop distinct and cohesive cultures.\nHow will company culture thrive?\nHuffington is doing both her new startup and the company that bears her name a favor here. With her decision to remain focused on just one challenge at a time, both of the projects she helped start can grow in new and exciting ways:\n\nThe Post will continue on with new publishers, editors, managers and policies. Her absence will be keenly felt for a while, but the culture that grows in her absence will be all the stronger for it, thanks to new perspectives, ideas and leadership philosophies. We speak of diversity across a workforce as a positive thing, but a diversity of leadership may be just as important. Huffington is giving the Post that kind of diversity.\nThrive Global will be receiving a seasoned and passionate leader, as well as the benefit of hindsight and a strong idea of what to do and what not to do. The company will be free to explore what works and what does not, but it will inherit the best of what HuffPo\u2019s existing culture has to offer \u2014 while still being able to move into uncharted territory.\nPerhaps most importantly, both of these businesses will be able to retain their respective personalities, branding and culture. Huffington wouldn\u2019t have been the first to lead multiple companies, but she would have run the risk of having the two companies become blurred in the public consciousness, to the point where one may be permanently associated with the other. Not a bad thing, necessarily, but we see again and again what happens a company fails to achieve its own identity \u2014 or when a company spreads itself too thin.\n\nDon\u2019t divide to conquer\nWe have yet to see how Musk\u2019s dual stewardship over Tesla and SolarCity will play out, but for our money, Huffington is the one that got this right. It\u2019s hard to imagine companies as different as HuffPo and Thrive Global \u201cgrowing up\u201d with the same leader at the tiller. No matter how strong her leadership may have continued to be, both companies have radically different mission statements and exist to pursue very different goals. They deserve distinct leadership and culture as they grow into the companies they were meant to become.\nThat\u2019s the takeaway here, and it echoes Huffington\u2019s words from earlier: She\u2019s going where her \u201cfull attention\u201d is required. She\u2019s kicking the Post out of the nest, and now she has the distinct pleasure of watching it fly on its own.