REI President, Dave Ruback, Dies at Age 56 June 20, 2012 From Radio Engineering Ind. (REI) David Ruback, president of Radio Engineering Industries Inc. (REI), lost his battle with pancreatic cancer on Tuesday, May 22, 2012. He was 56 years old. Ruback is survived by his wife, Marcy, and two sons, Joe and K.C. Ruback.