Mr. Leininger was a professor at Concordia University St. Paul, Minnesota in Fine Arts and Humanities teaching music history and theory as well as taught class and private piano for more than 35 years. He choirs for about 25 years during which time he conducted more than four-hundred public concerts in the U.S. and Canada.
In the last ten years or so he taught Interdisciplinary courses as well as studies in critical thinking. He was strongly involved in multicultural studies and counseling.
Chinese history has been a strong interest of his especially since his son has worked there and has a Chinese wife and two children. His interests have concentrated on the history of Christianity in China, especially since about 1900. He strive to learn the Chinese language, mostly on his own.