Mission Specialist Educators, or "Educator Astronauts", were first selected in 2004, and as of 2007, there are three NASA Educator astronauts: Joseph M. Acaba, Richard R. Arnold, and Dorothy Metcalf-Lindenburger.
mˈɪʃən spˈɛʃəlˌɪst ˈɛdʒuːkˌeɪɾɚz, ɔːɹ "ˈɛdʒuːkˌeɪɾɚɹ ˈæstɹənˌɔːts", wɜː fˈɜːst sᵻlˈɛktᵻd ɪn tˈuː θˈaʊzənd fˈoːɹ, ænd æz ʌv tˈuː θˈaʊzənd sˈɛvən, ðɛɹˌɑːɹ θɹˈiː nˈæsɐ ˈɛdʒuːkˌeɪɾɚɹ ˈæstɹənˌɔːts: dʒˈoʊsəf ˈɛm. ɐkˈɑːbə, ɹˈɪtʃɚd ˈɑːɹ. ˈɑːɹnəld, ænd dˈɔːɹəθi mˈɛtkæflˈɪndənbbˌɜːɡɚ.