Stefany was born and raised in North Vancouver B.C. She is the only daughter of the late Squamish Nation hereditary Chief Joe Mathias and Janice Antoine, who is the principal of the Coldwater School in Merritt, BC. She now carries the title of Hereditary Chief.
Stefany graduated from the University of British Columbia (UBC) theatre program and continued in theater until she was noticed by Chris Haddock who cast her in his acclaimed TV series DaVinci's Inquest, where she played a recurring role. She then went on to appear in Da Vinci City Hall, The Collector, and several independent feature-length and short films while living in Vancouver.
Stefany moved to Los Angeles in 2011 where she continued to pursue her acting career and also discovered a passion for directing. Stefany co-wrote and co-directed a short film, wrote and directed another, and went on to direct one more. Gloriana the most recent short she directed, was just accepted into the Coronado Island Film Festival in November. She also appeared in Longmire, Blood & Oil, and most recently just finished filming a feature film called Monkey Beach, directed by a First Nations woman, Loretta Todd.
She also attended the Vancouver Film School for film production and directing after graduating from UBC.
Currently, Stefany continues to act, has a feature film in development as a writer and is looking at a project for directing. She splits her time between British Columbia and Los Angeles.