Expertise is traditionally classified into perceptual, cognitive, and motor forms. I argue that the empirical research literature on expertise gives us compelling reasons to reject this traditional classification and accept an alternative. According to the alternative I support there is expertise in forming impressions, which further divides into expertise in forming sensory and intellectual impressions, and there is expertise in performing actions, which further divides into expertise in performing mental and bodily actions. The traditional category of cognitive expertise splits into two–expertise in forming intellectual impressions and expertise in performing mental actions. I consider and address a challenge to my case in favor of adopting this alternative classification of expertise that derives from dual process theories of cognition.