Oscar Hammerstein II Mathias by his first wife, and James Hammerstein by his second wife, with whom he also had a stepdaughter, Susan Blanchard. Hammerstein was one of the most important "book writers" in Broadway history – he made the story, not the songs or the stars, central to the musical and brought musical theater to full maturity as an art form. According to Stephen Sondheim, "What few people understand is that Oscar's big contribution to the theater was as a theoretician, as a Peter Brook, as an innovator. People don't understand how experimental "Show Boat" and "Oklahoma!" felt at the time they
Rodgers and Hammerstein from Syracuse" (1938), "Pal Joey" (1940), and "By Jupiter" (1942), as well as many successful film projects. Hammerstein, a co-writer of the popular Rudolf Friml 1924 operetta "Rose-Marie", and Sigmund Romberg operettas "The Desert Song" (1926) and "The New Moon" (1928), began a successful collaboration with composer Jerome Kern on "Sunny" (1925), which was a hit. Their 1927 musical "Show Boat" is considered to be one of the masterpieces of the American musical theatre. Other Hammerstein/Kern collaborations include "Sweet Adeline" (1929) and "Very Warm for May" (1939). Although the last of these was panned by critics, it contains one of