Expertise  Applied research on the physics and phenomenology of lightning.  Use of ground-based electromagnetic sensing in support of the upcoming launch (October 2016) of the world's first geostationery lightning mapper onboard GOES-R.  Use of multiple high-speed cameras, lightning location systems, and remote electric and magnetic field measurements to study the incidence and behavior of cloud-to-ground lightning in the U.S., Canada, Europe, South America, and Japan.