▁later ▁in ▁Str as bourg ▁with ▁Hans ▁Pf itz ner . ▁His ▁conduct ing ▁debut ▁was ▁in ▁Bres lau ▁in ▁ 1 9 2 3 . ▁He ▁then ▁worked ▁as ▁musical ▁director ▁and ▁opera ▁conduct or ▁in ▁Ess en ▁( 1 9 2 4 – 3 1 ) ▁and ▁Dort mund ▁( until ▁ 1 9 3 3 ). ▁ ▁In ▁Dort mund ▁he ▁had ▁to ▁leave ▁his ▁position ▁in ▁the ▁spring ▁of ▁ 1 9 3 3 ▁due ▁to ▁the ▁Naz i ▁rise ▁to ▁power . ▁He ▁em igr ated ▁first ▁to ▁France ▁and ▁later ▁to ▁the ▁United ▁States . ▁He ▁conducted ▁the ▁Monte ▁Carlo ▁opera ▁in ▁ 1 9 3 6 ▁and ▁ 1 9 3 7 . ▁ ▁While ▁in ▁France , ▁he ▁was ▁also ▁the ▁teacher ▁of ▁composer ▁L uk as ▁F oss , ▁who ▁studied ▁orch estr ation ▁with ▁him . ▁ ▁In ▁ 1 9 3 8 ▁he ▁moved ▁to ▁New ▁York ▁city , ▁where ▁he ▁worked ▁as ▁an ▁assistant ▁conduct or ▁at ▁the ▁Metropolitan ▁Opera , ▁where ▁he ▁stayed ▁until ▁ 1 9 4 7 . ▁In ▁ 1 9 4 8 ▁he ▁followed ▁a ▁call ▁to ▁the ▁New ▁England ▁Conserv atory ▁in ▁Boston , ▁where ▁he ▁taught ▁for ▁two ▁dec ades . ▁He ▁died ▁in ▁Boston , ▁aged ▁ 7 8 . ▁ ▁Musical ▁compos itions ▁and ▁editing ▁Wolf es ▁composed ▁at ▁least ▁ 1 4 0 ▁songs ▁that ▁are ▁published . ▁ ▁Most ▁were ▁composed ▁after ▁he ▁moved ▁to ▁Boston , ▁but ▁he ▁continued