Jeff Foulk has had a crazy few months. Developer of the navigation app Argo, Foulk saw his creation go from modest success to viral sensation after daughter Megan posted a video of Dad trying to pitch the app to Chicago Boat Show attendees. That video now has an astonishing 28 million views—and Foulk’s Argo briefly ranked above heavyweights Google Maps and Waze on both app stores. But let’s let him tell it.