Prior to 90210 she appeared in Southland, Cold Case and Cupid. She played a recurring role in 90210 during the second season from 2009 to 2010, as a young Californian surfer named Ivy Sullivan. In February 2010, she was signed as a regular cast member for the third season of the show. In 2011, Zinser starred in the MTV movie thriller The Truth Below, as the sole leading female in a cast of men. Zinser plays a confident 18-year-old whose world is upended, first by romantic misunderstandings, then by a crash that leaves her and three friends trapped under an avalanche. Zinser's other credits include Southland, Cold Case and Cupid. Zinser graduated from NYU and currently divides her time between Venice, California, and New York.
- She attended New York University in New York City, NY.
- Gillian was one of Coup De Main’s 2010 favourite styled celebrities… her effortlessness hippie-chic is definitely envy-worthy!