Correll is known for studying the psychology of racial bias, especially as it pertains to police shootings. For example, he was the lead author of a 2007 study which showed that police officers' decisions to shoot were less influenced by the race of a suspect than were those of civilians. The study had 157 Denver police officers, 113 police officers from other parts of the country, and 245 Denver-area civilians play a video game which simulated confrontations with armed and unarmed individuals of various races.