cement ▁of ▁Science ▁( V ice - Pres ident ▁in ▁ 1 9 2 1 ), ▁American ▁Astronom ical ▁Society ▁( V ice - Pres ident ▁ 1 9 2 5 – 1 9 2 7 ), ▁Royal ▁Astronom ical ▁Society ▁( f ellow ▁and ▁associate ), ▁International ▁Astronom ical ▁Union ▁( pres ident ▁of ▁Commission ▁on ▁Sol ar ▁E cli ps es ▁and ▁Commission ▁on ▁St ell ar ▁Par alla xes ▁and ▁Pro per ▁Mot ions ), ▁American ▁Association ▁of ▁University ▁Prof ess ors ▁( ch air man ▁of ▁Committee ▁A , ▁on ▁Academ ic ▁Fre edom ▁and ▁Ten ure ), ▁American ▁Philosoph ical ▁Society , ▁and ▁the ▁American ▁Academy ▁of ▁Arts ▁and ▁Sciences . ▁ ▁Ice ▁hockey ▁career ▁ ▁While ▁studying ▁at ▁the ▁Joh ns ▁Hop kins ▁University ▁Mitchell ▁played ▁on ▁the ▁university ▁ice ▁hockey ▁team . ▁In ▁February ▁ 1 8 9 6 ▁he ▁was ▁a ▁part ▁of ▁the ▁Joh ns ▁Hop kins ▁team ▁that ▁played ▁against ▁the ▁Y ale ▁University ▁team ▁in ▁the ▁first ▁two ▁inter col leg iate ▁ice ▁hockey ▁games ▁in ▁the ▁United ▁States . ▁The ▁Joh ns ▁Hop kins ▁team ▁also ▁played ▁six ▁games ▁against ▁the ▁Baltimore ▁Athlet ic ▁Club ▁during ▁the ▁ 1 8 9 5 – 9 6 ▁season , ▁and ▁one ▁game ▁against ▁an ▁All - W ashington ▁aggreg ation . ▁ ▁As ▁an ▁ice ▁hockey ▁player ▁Mitchell ▁played ▁pre domin antly ▁at ▁the ▁point ▁position ▁which ▁is ▁an ▁arch a ic ▁ice ▁hockey ▁position ▁equivalent ▁to ▁a ▁def ensive ▁def ens eman