The lovable screen actor reflects on his slow evolution from starving artist to 'Knocked Up' and 'Step Brothers' scene-stealer to TV stalwart, what he learned on 'Party Down' and 'Parks and Recreation,' and how Ben Stiller's 2013 film 'The Secret Life of Walter Mitty' started him on the path to playing Mark — 'Innie' and 'Outie' — on the most Emmy-nominated TV show of the 2024-2025 season.

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