wˈɪljəm dʒˈiː. pˈɛɹi dʒˌeɪˈɑːɹ. nˈaɪntiːnhˈʌndɹɪd θˈɜːtiːn dʒˈænjuːˌɛɹi twˈɛlv, nˈaɪntiːnhˈʌndɹɪd nˈaɪnti ˈeɪt wʌz ɐn ˌɛdʒuːkˈeɪʃənəl saɪkˈɑːlədʒˌɪst hˌuː stˈʌdid ðə kˈɑːɡnᵻtˌɪv dɪvˈɛləpmənt ʌv stˈuːdənts dˈʊɹɹɪŋ ðɛɹ kˈɑːlɪdʒ jˈɪɹz.
William G. Perry Jr. (1913 – January 12, 1998) was an educational psychologist who studied the cognitive development of students during their college years.