Dr. Ellingson received his Ph.D. in electrical engineering from Ohio State University in 2000. Before going to Virginia Tech, he held research positions at Ohio State University, Raytheon, and Booz Allen Hamilton, Inc. Dr. Ellingson was previously a captain in the U.S. Army, on active duty between 1989 and 1993. His research interests are in the general areas of electromagnetics, applied signal processing, and instrumentation. He is specifically interested in direction finding, interference mitigation, wireless communications, radio astronomy, and the design of antennas and receivers. He has been working closely with the Long Wavelength Array. Dr. Ellingson is a member of the NRC’s Committee on Radio Frequencies and is a senior member of the Institute for Electrical and Electronics Engineers.