▁with ▁appeal ▁to ▁a ▁te en ▁audience . ▁Louis ▁Da P ron ▁was ▁the ▁group ' s ▁ch ore ograph er . ▁The ▁J iv in ' ▁Jack s ▁and ▁J ills ▁first ▁appeared ▁in ▁the ▁ 1 9 4 2 ▁musical ▁What ' s ▁Cook in ' ? ▁and ▁appeared ▁in ▁ 1 4 ▁mov ies ▁altogether . ▁Their ▁high - energy ▁style ▁may ▁be ▁contrast ed ▁with ▁the ▁more ▁precision - orient ed ▁approach ▁of ▁rival ▁musical - film ▁studio ▁M GM . ▁ ▁There ▁were ▁originally ▁four teen ▁members ▁in ▁the ▁group , ▁all ▁te en agers , ▁among ▁them ▁future ▁stars ▁Donald ▁O ' Con nor ▁and ▁Peg gy ▁Ryan . ▁Other ▁members ▁included ▁Roland ▁Dup ree , ▁Bobby ▁Sche erer , ▁D ott ie ▁B abb , ▁Dol ores ▁Mitchell , ▁Jack ▁McG ee , ▁Grace ▁Mac Donald , ▁Jean ▁Mc N ab , ▁Jane ▁Mc N ab , ▁David ▁Hol t , ▁and ▁C ork y ▁Ge il . ▁M emb ership ▁was ▁fluid : ▁at ▁the ▁time ▁of ▁Ch ip ▁Off ▁the ▁Old ▁Block ▁( 1 9 4 4 ) ▁there ▁were ▁twenty ▁members : ▁Sche erer ▁and ▁Harold ▁Bell , ▁Jerry ▁An tes , ▁Jack ▁C off ey , ▁D ante ▁Di Pa olo , ▁Low ell ▁Mc Pe ek , ▁Lou ▁Pay etta , ▁Pat ▁Ph el an , ▁George ▁Row land , ▁Jerry ▁S inger , ▁Ron ald ▁St anton , ▁Jean ▁Davis , ▁Dor othy ▁Web , ▁Sh ir ley ▁M ills