He taught from 1946 until 1957 when he proceeded to Columbus, Ohio to get his PhD degree in Nuclear physics from Ohio State University(1960). ನರಸಿಂಹಯ್ಯ ,ಅಮೇರಿಕಾದಲ್ಲಿ ಇದ್ದ ನಾಲ್ಕೂ ವರ್ಷಗಳು ಪ್ರತಿನಿತ್ಯ ಬೆಳಗ್ಗೆ, ಮಧ್ಯಾನ ತಿಂದದ್ದು ಬರಿ ಉಪ್ಪಿಟ್ಟು. ಒಂದೆಡೆ ಆವರೆ ಹೇಳುವಂತೆ ಪ್ರಪಂಚದಲ್ಲಿಯೇ ವಿಶ್ವ ದಾಖಲೆ ಮಾಡಿದ್ದೇನೆ ಎಂದು ಆವರೆ ಹೇಳುತ್ತಾರೆ . During 1961-72 he led National College, Basavanagudi, Bangalore, as its principal. During 1967-68, as a Fulbright Scholar, Dr. Narasimhaiah taught as a Visiting Professor at Southern Illinois University at Carbondale, Illinois. In 1962, he founded the Bangalore Science Forum, which conducts a weekly series of public lectures on science topics.
He published a collection of essays entitled "Tereda Mana" (”ತೆರೆದ ಮನ’) (Open Mind) and an auto-biography named "Horaatada Haadi" (’ಹೋರಾಟದ ಹಾದಿ’), (The Path of Struggle) which were awarded sahitya academy book prizes
" I got an opportunity to see him & take an autograph around 6-7 years ago. I saw him in Bangalore.Ravindra kalakshetra ". (ರವಿಂದ್ರ ಕಲಾಕ್ಷೇತ್ರ ) .
He stayed in a hostel with mat & couple of old trunks although he was in big post. He was unmarried.When some body asked abouth this ,he said with humor : Oh I forgot to get marry..
Narasimhaiah had interactions with Mahatma Gandhi and translated Mahatma Gandhi’s Hindi speech into Kannada, when the latter visited the National High School.
During his tenure as Vice-Chancellor, he constituted and chaired The Committee to Investigate Miracles and Other Verifiable Superstitions, to scientifically investigate claims of miracles and paranormal phenomena. The committee challenged the claims of Sathya Sai Baba, one of the most prominent godmen of India, who said that he could materialize holy ash and gold chain from nothing. A public controversy ensued, causing some of the godman's followers to desert him.
As the Vice-Chancellor of the Bangalore University from 1973–77 (೧೯೭೩-೭೭) , he introduced psychology, social work, drama, music and dance as subjects. He went on to serve the State Legislative Assembly; and in 1984 (೧೯೮೪) , received the Padma Bhushan from the Indian Government. At the time of his death on January 31, 2005 * (ಜನವರಿ ೩೧ ೨೦೦೫) , Dr. Narasimhaiah was the President of the National Education Society.