ðɪ ˈɑːɪd wʌz fˈaʊndᵻd ɪn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɛvənti sˈɪks baɪ ɪdwˈɑːəd sˈeɪɡwɪn, ænd ɪz ðɪ ˈoʊldɪst pɹəfˈɛʃənəl ɐsˌoʊsɪˈeɪʃən kənsˈɜːnd wɪð ˌɪntəlˈɛktʃuːəl ænd dɪvˈɛləpmˈɛntəl dˌɪsɐbˈɪləɾiz.
The AAIDD was founded in 1876 by Édouard Séguin, and is the oldest professional association concerned with intellectual and developmental disabilities.