About this time, Bitter was discovered by Richard Morris Hunt, the architect of choice of many of New York's rich and famous. From that time on Bitter was never without work. After working as a sculptor at the World's Columbian Exposition in Chicago in 1893 and as director at the Pan-American Exposition in Buffalo, New York in 1901, Bitter's extraordinary organizational skills led him to be named head of the sculpture programs at both the 1904 St. Louis Exposition in St. Louis, Missouri, where Lee Lawrie trained with his guidance, and the 1915 Panama–Pacific International Exposition held in San Francisco, California. In 1906/1907, he presided over the National Sculpture Society.