Gary's research involves fundamental physical processes in the solar atmosphere, high-energy particle acceleration in the Sun, and advanced instrumentation and techniques in radio astronomy. Gary has been a leader in the use of solar radio data for examining the conditions under which solar radio bursts from distinct solar events can disturb or disrupt entirely cellular telephone signals emanating from cell tower sites. He was involved in the recent discovery that such bursts also cause failures in Global Positioning System (GPS) receivers. His research is essential to understanding and mitigating the conditions under which such deleterious effects of solar events can occur.