He Was A Professor Of Aerospace Engineering At Cincinnati University

Armstrong announced that he has no plans to fly in space again shortly after Apollo 11. He was assigned as the Office of Advanced Research and Technology Deputy Associate Administrator for Aeronautics, held the position for a year, and then left ARPA and NASA in 1971. He chose the University of Cincinnati over other schools, including his alma mater Purdue, for his teaching position because Cincinnati had a small aerospace department. He expressed his hope that the faculty there wouldn't be offended that he had gone straight into a professorship with only a USC master's degree. Years prior, when stationed at Edwards, he started his master's degree. After Apollo 11, he finished it by submitting a report on various aspects of Apollo rather than a thesis on the modeling of hypersonic flight.

Armstrong held the position of University Professor of Aerospace Engineering at Cincinnati. He designed the graduate-level courses in experimental flight mechanics and aircraft design while also taking on a significant teaching load. He was regarded as an excellent educator and a strict grader. He later regretted not including his work at NASA in his research pursuits during this period because he did not want to appear to be favoritism. Armstrong retired from teaching in 1980 after eight years of service.