About Our Hearing Center
Mountain Plains Audiology was started in western South Dakota in 1978 by Michael Colleran. Denny Geinger joined the practice in the early 1980's. In the early 1990's, Michael Colleran and Denny Gienger split the practice, with Mr. Colleran moving to Pierre and Mr. Gienger staying in Rapid City. Norman Sorensen joined the practice in 1999, and completed the purchase of the practice in 2001.