 She argued many cases before the Court of Appeals and the state Supreme Court, including 97 published cases that set precedent.While still in law school, Quinn-Brintnall worked for King County, Washington as a Rule 9 intern on felony prosecutions and appeals.After completing law school, she clerked for Judge James A. Andersen at the Court of Appeals, Division I, and then worked for King County as a deputy prosecuting attorney.