There isn't a definitive answer for this question but perhaps it would be the show runner, Al Jean.
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The Simpsons creator Matt Groening is 63 years old (birthdate: February 15, 1954).
If you meant to spell "Simpsons", Matt Groening created the television series "The Simpsons"
His family inspired him in creating The Simpsons which is why they are named after them.
Matt Groening created them and he & producer James L. Brooks turned Matt's characters into a series.
As of 01|01|2015, No, Matt Groening is alive.