9 5 0 . ▁He ▁started ▁an ▁app rent ices hip ▁as ▁a ▁mechan ic ▁at ▁Trump f ▁and ▁then ▁studied ▁mechanical ▁engineering ▁at ▁the ▁Stuttgart ▁Technology ▁University ▁of ▁App lied ▁Sciences . ▁After ▁gradu ating ▁with ▁a ▁Diplom , ▁he ▁became ▁a ▁development ▁engineer ▁in ▁ 1 9 5 8 ▁at ▁C inc inn ati ▁Mill ing ▁Mach ines ▁( today ▁Mil ac ron ) ▁in ▁C inc inn ati . ▁In ▁ 1 9 6 1 ▁he ▁returned ▁to ▁Germany ▁and ▁to ▁Trump f ▁as ▁head ▁of ▁the ▁engineering ▁division . ▁In ▁ 1 9 6 8 ▁he ▁developed ▁the ▁first ▁cont our ▁n ib bling ▁machine ▁tool ▁with ▁numerical ▁control . ▁The ▁owner ▁of ▁the ▁company , ▁Christian ▁Trump f , ▁having ▁no ▁children , ▁named ▁Le ib inger ▁as ▁his ▁successor . ▁Le ib inger ▁success ively ▁took ▁over ▁shares ▁of ▁the ▁company ▁and ▁served ▁as ▁technical ▁director ▁from ▁ 1 9 6 6 . ▁He ▁was ▁man aging ▁director ▁and ▁partner ▁from ▁ 1 9 7 8 . ▁On ▁ 1 8 ▁November ▁ 2 0 0 5 , ▁he ▁retired ▁from ▁management ▁and ▁served ▁as ▁chairman ▁of ▁the ▁super vis ory ▁board ▁of ▁the ▁Trump f ▁Group ▁until ▁the ▁end ▁of ▁ 2 0 1 2 . ▁On ▁ 1 6 ▁October ▁ 2 0 1 8 , ▁he ▁died ▁in ▁Stuttgart ▁at ▁the ▁age ▁of ▁ 8 7 . ▁ ▁Entre pr ene ur ial ▁and ▁engineering ▁achiev ements ▁▁ ▁Under ▁the ▁management ▁of ▁Le ib