 The Office employs an ensemble cast. Most of the main characters, and some minor ones, are based on characters from the British version of The Office. While these characters normally have the same attitudes and perceptions as their British counterparts, the roles have been redesigned to better fit the American show. The show is known for its large cast size, many of whom are known particularly for their improvisational work. Rainn Wilson portrays Dwight Schrute, who, based upon Gareth Keenan, is the Assistant to the Regional Manager, although the character frequently fails to include "to the" in his title. John Krasinski portrays Jim Halpert, a sales representative and prankster, who is based upon Tim Canterbury, and is married to Pam Halpert, the office administrator. Pam (Jenna Fischer), who is based on Dawn Tinsley, is shy, but is often a cohort with Jim in his pranks on Dwight. Ed Helms plays Andy Bernard, the preppy manager — who was previously a salesman — and boastful Cornell alumnus whose love for a cappella music and awkward social skills generates mixed feelings from his employees.
