▁and ▁small ▁sw imming ▁pool . ▁ ▁He ▁would ▁end ▁up ▁living ▁there ▁the ▁rest ▁of ▁his ▁life . ▁ ▁In ▁ 1 9 5 5 , ▁H older er ▁became ▁an ▁American ▁citiz en . ▁ ▁H older er ' s ▁area ▁of ▁expert ise ▁was ▁aer od ynam ics . ▁According ▁to ▁Space ▁Histor ian ▁and ▁former ▁NASA ▁public ist ▁Ed ▁Buck be e , ▁H older er ▁personally ▁brought ▁America ' s ▁first ▁ro cket ▁wind ▁tunnel ▁from ▁Germany ▁and ▁set ▁it ▁up ▁for ▁early ▁testing . ▁ ▁At ▁Red stone ▁Ar sen al , ▁he ▁worked ▁as ▁a ▁mechanical ▁engineer , ▁designer , ▁and ▁fabric ator . ▁ ▁He ▁designed ▁the ▁wind ▁tunnel ▁used ▁for ▁Sat urn ▁V ▁testing ▁and ▁o vers aw ▁the ▁tunnel ' s ▁construction ▁at ▁the ▁Marshall ▁Space ▁Fl ight ▁Center . ▁The ▁Sat urn ▁V ▁later ▁power ed ▁Apol lo ▁ 1 1 ▁on ▁its ▁successful ▁moon ▁landing . ▁ ▁Descri bing ▁the ▁project ▁many ▁years ▁later , ▁H older er ▁said ▁the ▁historical ▁significance ▁of ▁the ▁project ▁was ▁not ▁felt ▁at ▁the ▁time , ▁but ▁that ▁he ▁" was ▁amaz ed ▁when ▁[ he ] ▁heard ▁what ▁they ▁had ▁in ▁mind ." ▁ ▁The ▁same ▁wind ▁tunnel ▁is ▁still ▁used ▁by ▁NASA ▁for ▁testing ▁as ▁of ▁ 2 0 1 5 . ▁ ▁H older er ▁was ▁promoted ▁several ▁times ▁and ▁found ▁he ▁did ▁not ▁like ▁management . ▁" I ' m ▁a ▁hands - on ▁man ," ▁he ▁said . ▁" I