▁became ▁a ▁member ▁of ▁the ▁Stutt g arter ▁Künstler bund ▁( St utt gart ▁Art ists ' ▁Association ), ▁and ▁in ▁ 1 9 0 6 ▁he ▁joined ▁the ▁Deutsch er ▁Künstler bund ▁( G erman ▁Art ists ' ▁Association ). ▁In ▁ 1 9 0 7 ▁he ▁married ▁fellow - p ain ter ▁and ▁child hood ▁friend ▁and ▁neighbor , ▁Maria ▁Fil ser . ▁In ▁ 1 9 1 3 , ▁he ▁was ▁a ▁found ing ▁member ▁of ▁the ▁artists ' ▁association ▁Mün ch ener ▁Neue ▁Sec ession , ▁to ▁which ▁pain ters ▁like ▁Alex ej ▁von ▁J aw l ens ky , ▁Adolf ▁Er b sl öh , ▁W lad imir ▁von ▁Be chte je ff , ▁Paul ▁Kle e , ▁and ▁Alexander ▁Kan old t ▁also ▁belonged . ▁In ▁ 1 9 1 9 ▁he ▁became ▁the ▁chairman ▁of ▁the ▁association . ▁A ▁high ▁point ▁of ▁Cas par ' s ▁work ▁was ▁the ▁Pass ion ▁Alt ar ▁of ▁ 1 9 1 6 / 1 9 1 7 , ▁hous ed ▁in ▁the ▁crypt ▁of ▁the ▁Frauen kirche . ▁ ▁From ▁ 1 9 2 2 ▁to ▁ 1 9 3 7 ▁Cas par ▁was ▁a ▁professor ▁at ▁the ▁Academy ▁of ▁Fine ▁Arts ▁in ▁Mun ich . ▁His ▁works ▁were ▁exhib ited ▁in ▁the ▁D eg ener ate ▁Art ▁Ex hib ition , ▁which ▁was ▁organized ▁in ▁Mun ich ▁by ▁the ▁Naz is ▁in ▁ 1 9 3 7 . ▁There after , ▁his ▁Christian ity - in sp ired