Cfo Thought Leader

What sets John Rettig’s CFO journey apart from most is not just its length—spanning more than two decades—but its unusual symmetry. His CFO career roughly divides into two decade-long tenures: first helping scale a digital advertising firm from $15 million to $250 million in revenue, and now serving as CFO of Bill, where he’s helped lead the company from startup to public market success.When Rettig joined Bill, the company had just $13 million in revenue and a modest employee base. What drew him in, he tells us, was the combination of people, culture, and a product that placed finance operations at the center of its design. It was the first time in his career that he’d worked this closely with a finance-focused technology platform.At the time, Rettig anticipated a 10x growth opportunity—similar to his earlier experience. “It turns out, it’s 100x,” he tells us. Today, Bill has 2,500 employees, serves 500,000 customers, and supports a network of 7 million members. The company processes $300 billion in annual pa