The sitcom writer Justin Spitzer had his first script credit on "Scrubs," the archetypal workplace comedy set in a hospital. Twenty years later, Spitzer returns to the genre with NBC's "St. Denis Medical,

It took the U.S. version of The Office about five seasons to complete its full, multi-phase journey from awkwardly derivative cringe comedy to richly populated ensemble to cuddly comfort watch. Parks and Recreation made the trip at a quicker pace,