Philip R. Kennedy, MD, PhD, a Neurologist with Neural Signals, Inc. & Robert A. Gadlage, MD FACS & Associates P.C. Get to know Neurologist Dr. Philip R. Kennedy, who serves patients in Atlanta and Duluth, Georgia. Working as a neuroscientist and neurologist, Dr. Kennedy is Chief Scientist & CEO of Neural Signals, Inc. which he founded in 1989..