▁America ▁( AR CA ) ▁( a ▁for er un ner ▁of ▁the ▁Sports ▁Car ▁Club ▁of ▁America ) ▁in ▁ 1 9 3 1 . ▁Mitchell ▁became ▁the ▁official ▁illustr ator ▁of ▁the ▁club ▁and ▁his ▁sketch es ▁for ▁the ▁club ▁eventually ▁came ▁to ▁the ▁attention ▁of ▁Har ley ▁Earl , ▁then ▁head ▁of ▁General ▁Mot ors ▁Art ▁and ▁Col our ▁Section . ▁ ▁At ▁General ▁Mot ors ▁Corporation ▁ ▁Art ▁and ▁Col our ▁Section ▁Based ▁on ▁sketch es ▁Mitchell ▁created ▁as ▁the ▁official ▁illustr ator ▁for ▁the ▁AR CA , ▁Har ley ▁Earl ▁rec ru ited ▁Mitchell ▁to ▁General ▁Mot ors ' ▁then ▁new ▁Art ▁and ▁Col our ▁Section ▁on ▁ 1 5 ▁December ▁ 1 9 3 5 . ▁ ▁Chief ▁Design er , ▁Cad illa c ▁In ▁ 1 9 3 6 ▁Earl ▁appointed ▁Mitchell ▁as ▁the ▁Chief ▁Design er ▁in ▁the ▁then ▁newly ▁created ▁Cad illa c ▁design ▁studio . ▁ ▁Director ▁of ▁St y ling ▁( under ▁the ▁Vice ▁President ▁of ▁sty ling ▁section ) ▁On ▁May ▁ 1 , ▁ 1 9 5 4 ▁Mitchell ▁became ▁General ▁Mot ors ▁Director ▁of ▁St y ling ▁under ▁Har ley ▁Earl . ▁ ▁Vice ▁President , ▁St y ling ▁Section ▁( in ▁charge ▁of ▁all ▁sty ling ▁at ▁G M ) ▁In ▁December ▁ 1 9 5 8 , ▁Har ley ▁Earl ▁reached ▁G M ' s ▁mand atory ▁ret irement ▁age ▁of ▁ 6 5 ▁and ▁thus ▁retired ▁from ▁his ▁position ▁as ▁chief ▁sty list . ▁The ▁