ɪn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd twˈɛnti tˈuː, dʒˈɛfɹiz ɹᵻsˈiːvd ɐn ɐpˈɔɪntmənt ʌv stˈæf sˈɜːdʒən tə ðə hˈaɪk, ænd wʌz ɐsˈaɪnd tə kælkˈʌɾə, wˌɛɹ hiː wʌz ɐsˈaɪnd tə dˈuːɾiz æt ðə dʒˈɛnɚɹəl hˈɑːspɪɾəl.
In 1822, Jeffreys received an appointment of staff surgeon to the HEIC, and was assigned to Calcutta, where he was assigned to duties at the General Hospital.