ɪn nˈaɪntiːnhˈʌndɹɪd sˈɪksti tˈuː, nˈoʊltən ˈɜːnd hɪz pˌiːˈeɪtʃ.dˈiː. dᵻɡɹˈiː fɹʌmðə dᵻpˈɑːɹtmənt ʌv ᵻlˈɛktɹɪkəl ˌɛndʒɪnˈɪɹɪŋ æt ðə mˌæsɐtʃˈuːsɪts ˈɪnstɪtˌuːt ʌv tɛknˈɑːlədʒi ɪn nˈaɪntiːnhˈʌndɹɪd sˈɪksti tˈuː ˌʌndɚ ðə suːpɚvˈɪʒən ʌv vˈɪktɚɹ ˈʌŋv.
In 1962, Knowlton earned his Ph.D. degree from the Department of Electrical Engineering at the Massachusetts Institute of Technology in 1962 under the supervision of Victor Yngve.