9 7 0 . ▁After ▁separ ating ▁from ▁the ▁service , ▁he ▁continued ▁his ▁formal ▁education ▁at ▁the ▁University ▁of ▁Maryland , ▁ear ning ▁a ▁B A ▁in ▁history , ▁cum ▁la ude . ▁Winter ▁joined ▁the ▁National ▁Air ▁and ▁Space ▁Museum ▁( N AS M ) ▁in ▁ 1 9 6 8 ▁as ▁a ▁temporary ▁part - time ▁employee . ▁In ▁ 1 9 7 0 ▁he ▁became ▁a ▁full - time ▁employee ▁as ▁a ▁historical ▁research ▁cl erk . ▁From ▁ 1 9 7 1 ▁he ▁has ▁presented ▁scholar ly ▁papers ▁on ▁the ▁history ▁of ▁ro cket ry ▁at ▁International ▁A str onaut ical ▁Federation ▁con gress es , ▁at ▁International ▁Congress es ▁of ▁the ▁History ▁of ▁Science , ▁and ▁at ▁other ▁similar ▁gather ings . ▁ ▁In ▁ 1 9 8 0 ▁he ▁became ▁an ▁historian ▁at ▁the ▁Museum . ▁Then , ▁in ▁ 1 9 8 4 , ▁he ▁was ▁named ▁the ▁Cur ator ▁of ▁Ro cket ry , ▁a ▁position ▁he ▁held ▁until ▁ 2 0 0 7 ▁when ▁he ▁retired . ▁In ▁ 1 9 9 6 ▁Winter ▁presented ▁the ▁American ▁A str onaut ical ▁Society ' s ▁first ▁God d ard ▁Memorial ▁L ect ure ▁and ▁received ▁a ▁medal ▁for ▁it . ▁The ▁lecture ▁was ▁titled , ▁" Ro bert ▁H . ▁God d ard ▁ ▁The ▁Man ▁and ▁His ▁Ach iev ements ." ▁ ▁In ▁ 2 0 0 2 , ▁he ▁and ▁Ker rie ▁D ough ert y , ▁then ▁the ▁Power house ▁Museum