After completion of law school, Billings was admitted to the Utah State Bar and Utah Federal Bar in 1977 and, eventually, the Supreme Court of the United States in 1989. Her first job as a lawyer was as a trial lawyer and partner with Ray, Quinney & Nebeker, where she worked from 1976 to 1982. She litigated commercial, banking, corporate, employment, construction, products liability, securities and insurance cases in state and federal courts. Cases for the
Utah Court of Appeals varied from civil, criminal, administrative and domestic cases. Throughout her career, Billings has also served as a Chair of the Appellate Judges Conference of the
American Bar Association and President of the National Association of Women Judges. Latterly, Billings taught about the Judicial Process (see:
procedural law) at The University of Utah's
S.J. Quinney College of Law while serving as a current trustee of
Westminster College, member of the Board of Directors of the Park City Historical Society and Museum, member of the National Judicial College, active senior judge, mediator, arbitrator. == Judicial career ==