He received his Ph.D. in Audiology (psychoacoustics) and post-doctoral training in speech perception at the University of Wisconsin- Madison. Before coming to Purdue, he completed both clinical and post-doctoral fellowships at Boys Town National Research Hospital in Omaha, Nebraska. Professor Alexander’s research interests focus on auditory processes contributing to speech perception deficits in hearing-impaired listeners and signal processing to overcome them. Ongoing projects in his Experimental Amplification Research (EAR) laboratory include work on frequency-lowering techniques, wide dynamic range compression, and speech enhancement techniques.