biographical article needs additional citations for verification. Please help by adding reliable sources. Contentious material about living persons that is unsourced or poorly sourced must be removed immediately, especially if potentially libelous or harmful. (November 2009) Erik Per Sullivan Born Erik Per Sullivan July 12, 1991 (1991-07-12) (age 19) Worcester, Massachusetts, U.S. Occupation Actor Years active 1998–present Erik Per Sullivan (born July 12, 1991) is an American actor best known for his role as Dewey, the younger brother to middle child Malcolm, on the FOX series, Malcolm in the Middle which was on air for 7 years..