The consensus is that Andronicus of Rhodes collected the esoteric works of Aristotle's school which existed in the form of smaller, separate works, distinguished them from those of Theophrastus and other Peripatetics, edited them, and finally compiled them into the more cohesive, larger works as they are known today.
ðə kənsˈɛnsəs ɪz ðæt ændɹˈɑːnɪkəs ʌv ɹˈoʊdz kəlˈɛktᵻd ðɪ ˌɛsoʊtˈɛɹɪk wˈɜːks ʌv ˈæɹɪstˌɑːɾəlz skˈuːl wˌɪtʃ ɛɡzˈɪstᵻd ɪnðə fˈɔːɹm ʌv smˈɔːlɚ, sˈɛpɹət wˈɜːks, dɪstˈɪŋɡwɪʃt ðˌɛm fɹʌm ðoʊz ʌv θiːəfɹˈæstəs ænd ˈʌðɚ pˌɛɹɪpɐtˈɛɾɪks, ˈɛdɪɾᵻd ðˌɛm, ænd fˈaɪnəli kəmpˈaɪld ðˌɛm ˌɪntʊ ðə mˈoːɹ koʊhˈiːsɪv, lˈɑːɹdʒɚ wˈɜːks æz ðeɪ ɑːɹ nˈoʊn tədˈeɪ.