He was also convinced that there should be many more birth control clinics. “The best way to get a birth control program started,” he wrote, “is to put a field worker on the spot to get things organized and operating while I contribute the needed initial expense.” He hired Elsie Wulkop, a social worker whom he had known at Massachusetts General Hospital. She began work in Detroit in 1930 and during the next four years helped to open clinics in Michigan, Indiana, Missouri, Kansas, and Nebraska.