Investigators Radiant Research outshines. Our key premier research centers are managed by experienced principal investigators, who are nationally recognized as leaders in clinical research and in many therapeutic categories. Investigator Radiant Research Centers Abraham, William , MD, Principal Investigator Tucson AZ Adams, Michael ,  MD, Principal Investigator Salt Lake City UT Arguello, Fares , MD, Medical Director Salt Lake City UT Berger, Murray , MD, Principal Investigator Las Vegas NV Berwald, Bruce , MD, Medical Director St. Louis MO Billings, Michael , MD, Principal Investigator Greer SC Bleau, Brian , MD, Principal Investigator Tacoma WA Bolshoun, David , MD, Principal Investigator Denver CO Connor, Gordon  T. , MD, Principal Investigator Birmingham AL Cuevas, Eduardo , MD, Principal Investigator Tacoma WA Davidson, Michael , MD , Medical Director Chicago IL DeBry, Peter , MD, Principal Investigator Las Vegas NV Delahunty, Nigel  Patrick , MD, Principal Investigator Greer SC DePriest, Michael  W. , MD, Medical Director Las Vegas NV Dhar, Sanjay , MD, Principal Investigator Santa Rosa CA DuBoff, Eugene , MD, Assistant Medical Director Denver CO Dunlap, Frank  E. , MD, Medical Director Tucson AZ Ellison, W.  Travis , MD, Medical Director Greer SC Fixler, Charles , MD, Principal Investigator Cincinnati OH Funk, Sidney , MD, Medical Director Atlanta GA Geisberg, Harry  I. , MD, Medical Director Anderson SC Geohas, Jeffrey , MD, Medical Director Chicago IL Habros, Joseph , MD, Principal Investigator Scottsdale AZ Halpern, Stephen  W. , MD, Medical Director Santa Rosa CA Helmer, Tami , MD, Principal Investigator Minneapolis MN Hennessey, Thomas , MD, Principal Investigator St. Petersburg FL Herzog, Jo Lynne , MD, Principal Investigator Birmingham AL Humeniuk, John , MD, Principal Investigator Greer SC Jacob, Carolyn , MD, Principal Investigator Chicago IL James, Robert , MD, Principal Investigator Santa Rosa CA Jennings, William , MD, Medical Director San Antonio TX Juriansz, Jeremy , MD, Principal Investigator Santa Rosa CA Knoepp, Theresa , MD, , Principal Investigator Anderson SC Kopp, James , MD, , Principal Investigator Anderson SC Kyle, Michael , MD, Principal Investigator Chicago IL Malik, Hassan , MD, Internal Medicine Akron OH Marx, Phyllis , MD, Principal Investigator Chicago IL McCarty, F. Timm , DO, Principal Investigator Scottsdale AZ McCluskey, Dennis , MD, Medical Director Akron OH Miller, Bruce , MD, Principal Investigator Scottsdale AZ Miller, Kevin  B. , MD, Neurology and Psychiatry St. Louis MO Murray, John , MD, Principal Investigator St. Petersburg FL Murray, Linda , DO, Medical Director St. Petersburg FL Nedoss, Bertrand , MD, Principal Investigator Tucson AZ Noss, Michael  J. , MD, Medical Director Cincinnati OH Patel, Ashkokkumar , MD, General Surgery and Occupational Medicine St. Louis MO Petit, Carlos , MD, Principal Investigator Kansas City KS Powers, Jerold , MD, Principal Investigator Scottsdale AZ Reynolds, Michele , MD, Medical Director Dallas North TX Ricca, Louis , MD, Principal Investigator St. Petersburg FL Rodstein, Sheila , MD, Principal Investigator Minneapolis MN Romans, Bradford , MD, Principal Investigator Dallas North TX Rubin, Jay , MD, Principal Investigator San Antonio TX Schumacher, Douglas , MD, Medical Director Columbus OH Severance, Randall , MD, Medical Director Phoenix AZ Shingleton, Richard , Ph.D., Principal Investigator Salt Lake City UT Sislen, Donald  R , MD, Internal Medicine St. Louis MO Spector, Sidney , MD, Principal Investigator Scottsdale AZ Stein, Kenneth , MD, Principal Investigator Santa Rosa CA Tejada, Albert , MD, Principal Investigator Scottsdale AZ Throne, Martin , MD, FACP, Principal Investigator Atlanta GA Troy, Michael , MD, Principal Investigator San Antonio TX Weiss, Thomas  R , MD, Principal Investigator San Antonio TX Woodruff, Jr, Chivers , MD, Ph.D, Principal Investigator Birmingham AL Younglove, R. Hal , MD, Principal Investigator Kansas City KS

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