Keller Rinaudo is cofounder and CEO of Zipline, which is building drone delivery for global public health customers. Zipline has partnered with the country of Rwanda to make all last-mile deliveries of blood to half of the transfusing facilities in the country using drones. The long-term vision for this project is to put each of the 11 million citizens of Rwanda within a 15- to 30-minute delivery of any essential medical product they need, no matter where they live. Prior to Zipline, Keller was a software engineer and a professional rock climber. A graduate of Harvard University, Keller built computers out of RNA and DNA that can operate in human cells as molecular doctors. He published this research in _Nature Biotechnology_, becoming one of the youngest first authors in that publication’s history. You can find him on Twitter as @kellerrinaudo.