Jimmi Simpson started his career as an intern for David Letterman.

Watch his 6min recap of 'Westworld!'

DYK he used to share a room with Charlie Day?

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Jimmi Simpson used to be roommates with Charlie Day. 🔑

Check out more celebrity profiles of Rising Stars and superstars like Lucy Boynton, James Gandolfini or Bijou Phillips. Find fun facts about their age, birthday, star sign, height, relationships and career highlights. Scroll through categories like Dance and Entertainment or discover more Actors that are shaping today’s Movies.