▁ ▁Sch aff ▁wrote ▁extens ively ▁in ▁the ▁area ▁of ▁church ▁history ▁and ▁co - ed ited ▁the ▁Sch aff - Her z og ▁Encyclopedia . ▁He ▁completed ▁the ▁un fin ished ▁work ▁of ▁his ▁father , ▁Philip , ▁who ▁had ▁begun ▁the ▁History ▁of ▁the ▁Christian ▁Church ▁before ▁his ▁death . ▁The ▁young ▁Sch aff ▁also ▁wrote ▁two ▁books ▁on ▁the ▁life ▁of ▁John ▁Hus . ▁ ▁David ▁Sch ley ▁Sch aff ▁played ▁an ▁early ▁role ▁in ▁the ▁introduction ▁of ▁and ▁development ▁of ▁football ▁in ▁the ▁United ▁States . ▁ ▁A ▁gradu ate ▁of ▁the ▁Rugby ▁School ▁in ▁England , ▁he ▁was ▁familiar ▁with ▁the ▁game ▁of ▁football . ▁ ▁In ▁ 1 8 7 2 , ▁while ▁a ▁student ▁at ▁Y ale , ▁he ▁helped ▁organ ize ▁and ▁served ▁as ▁the ▁President ▁of ▁the ▁Y ale ▁Football ▁Association ▁and ▁was ▁the ▁Captain ▁of ▁Y ale ' s ▁first ▁inter col leg iate ▁football ▁team , ▁though ▁he ▁was ▁unable ▁to ▁play ▁in ▁their ▁first ▁game ▁because ▁of ▁injury . ▁ ▁Works ▁ ▁Author ▁ ▁Comment ary ▁on ▁the ▁Book ▁of ▁Act s ▁( 1 8 8 2 ) ▁ ▁Life ▁of ▁Philip ▁Sch aff ▁( New ▁York , ▁ 1 8 9 7 ) ▁ ▁John ▁H uss ▁( 1 9 1 5 ) ▁ ▁Editor ▁ ▁Sch aff - Her z og ▁Encyclopedia ▁( 4 ▁vol s ., ▁ 1 8 8 3 ) ▁ ▁History ▁of ▁the ▁Christian ▁Church ▁( V ols . ▁I - II , ▁ 1