▁of ▁the ▁Swiss ▁industrial ist , ▁. ▁During ▁that ▁time , ▁he ▁also ▁designed ▁trad ing ▁cards ▁for ▁the ▁St oll wer ck ▁ch oc olate ▁company . ▁He ▁married ▁a ▁singer ▁named ▁Johann a ▁Schw an ▁in ▁ 1 9 0 3 . ▁▁ ▁After ▁his ▁marriage , ▁Karl ▁Ernst ▁Ost haus ▁employed ▁him ▁at ▁the ▁painting ▁school ▁of ▁the ▁Fol kw ang - M useum s ▁in ▁H agen . ▁He ▁was ▁also ▁involved ▁in ▁design ing ▁books ▁for ▁S . ▁Fischer ▁Verlag . ▁In ▁ 1 9 0 4 , ▁he ▁participated ▁in ▁the ▁first ▁exhibition ▁of ▁the ▁ ▁Deutsch er ▁Künstler bund ▁at ▁the ▁Staat liche ▁Ant ik ens am ml ungen ▁and ▁provided ▁illustr ations ▁for ▁Der ▁B unt sche ck , ▁a ▁children ' s ▁book ▁by ▁Richard ▁De hm el . ▁In ▁ 1 9 0 7 , ▁with ▁a ▁recommendation ▁from ▁Bruno ▁Paul , ▁he ▁was ▁appointed ▁to ▁the ▁teaching ▁center ▁at ▁the ▁Kunst ge werb em useum ▁Berlin ▁and ▁he ▁joined ▁the ▁Berlin ▁Sec ession . ▁▁ ▁He ▁was ▁named ▁a ▁Professor ▁at ▁the ▁Kunst ge werb em useum ' s ▁school ▁in ▁ 1 9 1 0 , ▁where ▁he ▁taught ▁decor ative ▁painting ▁and ▁sketch ing ▁until ▁ 1 9 3 3 . ▁He ▁divor ced ▁Johann a ▁in ▁ 1 9 1 4 ▁and ▁was ▁cons cript ed ▁in ▁ 1 9 1 7 , ▁although ▁he ▁was ▁quickly ▁dismiss ed ▁from ▁service ▁due ▁to ▁a ▁heart ▁problem . ▁That ▁same