premise: Greg Tiernan and Conrad Vernon directed Sausage Party.
hypothesis: Greg Tiernan . Tiernan made his feature film debut with the long-gestating R-rated animated film Sausage Party ( 2016 ) , joining Conrad Vernon to direct production of a story conceived by Seth Rogen , Evan Goldberg and Jonah Hill . Sausage Party is a 2016 adult computer-animated comedy film directed by Greg Tiernan and Conrad Vernon and written by Kyle Hunter , Ariel Shaffir , Seth Rogen and Evan Goldberg .