Tona Cashman was born in Las Vegas, Nevada to Leah Barker and James Cashman, Sr. on September 23, 1924. She competed in beauty pageants and won both Miss Las Vegas and Miss Helldorado in 1941. She graduated from Las Vegas High School and attended finishing school in Missouri. She later attended Sawyers School of Business in Los Angeles, California. She married Robert L. Margison, but the couple divorced and she married Charles Henry Siefert. Siefert was a prominent banking executive in Las Vegas, Nevada. Tona Siefert worked in her family’s car business and was co-owner of Cashman Cadillac and James Cashman Co. She was also active in many community and civic groups. She passed away in Las Vegas on April 14, 1996.