Groening made his first professional cartoon sale of Life in Hell to the avant - garde Wet magazine in 1978 .
He is the creator of the comic strip Life in Hell as well as two successful television series , The Simpsons and Futurama .
creator made creator 's first professional cartoon sale comic strip     Hell to the avant - garde Wet magazine in 1978 .
He is the creator of the comic strip Life in Hell as well as two successful television series , The Simpsons and Futurama .