The word "Jennison" is spelled with a "j" sound at the beginning, represented by the IPA symbol /dʒ/. This is followed by the schwa sound, which is represented by the symbol /ə/. The next syllable contains the short "e" sound, represented by the symbol /ɛ/. The final syllable is pronounced with the long "i" sound, represented by the symbol /aɪ/. Therefore, the correct spelling of this word is "J-e-n-n-i-s-o-n", and its correct pronunciation is /dʒənɪsaɪn/.