Mildred Gertrude von Hollen was born in Chicago, Illinois, USA on December 26, 1891. Her father was Bernhard von Hollen and mother was Katherine Kitty Scheib. Her career in show business began as an actress with stock companies and progressed to radio drama in the 1920's. She married fellow actor Herbert Harrison Heyes on September 12, 1913 in Eldora, Hardin County, Iowa, USA. They had two children: Herbert Harrison Heyes, Jr., born on July 26, 1915 in Illinois, died January 5, 1999 in Laguna Hills, Orange Co., CA, USA, and Douglas Howard Heyes, born on October 27, 1919 in California, died February 8, 1993 in Los Angeles, CA, USA. Douglas Heyes was known as a writer/director for Maverick and Twilight Zone. Mildred and Herbert divorced around 1930 and she became a full-time working mother. The 1930 U.S. Census locates her residence as a rented apartment with her sons at the Guardian Arms in Los Angeles, CA, USA. A decade later the 1940 U.S Census identifies her as working in sales at a department store. In the 1950's she returned to acting and appeared in seventeen television programs representing nine series, most notably eight episodes of Rin Tin Tin. She appeared in two episodes of Dragnet and is remembered for a 1964 movie that was her final role, a sales lady, in Kitten with a Whip. Mildred passed away on August 22, 1971 in Laguna Hills, Orange County, CA, USA. Her internment was at El Toro Memorial Park, Lake Forest, Orange County, CA, USA.