Database: simpson_episodes
Question: Name the performer who won Emmy Award for Outstanding Voice-Over Performance by playing Homer simpson 20.
SQL: SELECT T1.person FROM Award AS T1 INNER JOIN Character_Award AS T2 ON T1.award_id = T2.award_id WHERE T2.character = 'Homer simpson 20' AND T1.organization = 'Primetime Emmy Awards' AND T1.award = 'Outstanding Voice-Over Performance' AND T1.result = 'Winner';