His Norwegian-American mother , Margaret Ruth ( née Wiggum ) ( March 23 , 1919 - April 22 , 2013 ) , was once a teacher , and his German American father , Homer Philip Groening ( December 30 , 1919 - March 15 , 1996 ) , was a filmmaker , advertiser , writer and cartoonist .
His father Homer Philip Groening was a filmmaker , advertiser , writer and cartoonist .