Along with fellow 1948 Olympians Brenda Helser and Nancy Merki, Zimmerman was part of the Multnomah Athletic Club team dubbed "Cody's Kids" that from 1939 to 1948, won 58 individual national swimming titles and three national team swimming championships.
Zimmerman, along with fellow Olympians Brenda Helser and Nancy Merki, was part of the Multnomah Athletic Club team nicknamed "Cody's Kids" that reigned supreme in national swimming events from 1939 to 1948, securing an impressive 58 individual victories and three team triumphs.