sky . ▁B adt ▁completed ▁his ▁doctor al ▁dis sert ation ▁on ▁Andrea ▁Sol ario ▁in ▁ 1 9 1 4 . ▁He ▁started ▁his ▁career ▁as ▁an ▁assistant ▁at ▁the ▁Kunst h alle ▁Bre men , ▁but ▁most ▁of ▁his ▁life ▁he ▁was ▁an ▁independent ▁scholar ▁teaching ▁priv ately , ▁as ▁his ▁family ▁was ▁wealth y ▁and ▁he ▁did ▁not ▁need ▁an ▁academic ▁job ▁in ▁order ▁to ▁ear n ▁a ▁living . ▁According ▁to ▁Alf ons ▁Ros enberg , ▁he ▁lived ▁the ▁life ▁of ▁a ▁Renaissance ▁human ist . ▁In ▁ 1 9 3 9 ▁he ▁left ▁Germany ▁gain ing ▁a ▁research ▁position ▁at ▁the ▁newly ▁founded ▁War burg ▁Institute ▁in ▁London . ▁He ▁returned ▁to ▁Germany ▁in ▁ 1 9 5 0 , ▁where ▁he ▁became ▁a ▁German ▁citiz en ▁in ▁ 1 9 5 2 ▁and ▁helped ▁to ▁re organ ize ▁the ▁university ▁system . ▁His ▁writ ings ▁include ▁studies ▁on ▁Wilhelm ▁Le hm b ruck , ▁Eug ène ▁Del ac ro ix , ▁Nicolas ▁P ous sin , ▁Jan ▁V erme er , ▁John ▁Const able , ▁Paul ▁C é z anne , ▁Rap ha el , ▁Vincent ▁van ▁G og h , ▁Paolo ▁Ver on ese , ▁Ernst ▁Bar lach ▁and ▁attacks ▁on ▁the ▁method ology ▁of ▁the ▁" second ▁Vienna ▁school " ▁of ▁art ▁history ▁domin ated ▁by ▁Hans ▁Sed l may r . ▁He ▁considered ▁" master pie ces " ▁to ▁be ▁the ▁only ▁works ▁of ▁art ▁worth ▁studying . ▁ ▁B adt ▁rad ically ▁separated