Sydney began acting at the age of eight in local theater in her hometown of Boulder, Colorado.

At age seventeen, she moved to Hollywood with her mother to pursue a screen acting career.

[2] She appeared in the television series ER, Drake & Josh, Oliver Beene, Masters of Horror, The Brotherhood of Poland, New Hampshire, Femme Fatales and Chemistry.

[3][4] Besides acting, Sydney along with her mother Marian Heymsfield created the company Zorbitz in 2003.

Through the Zorbitz company they sell a number of children's products in which they donate a portion of each sale to charities worldwide.