Piper graduated from the University of Puget Sound and received her law degree in 1994 from the Columbus School of Law at Catholic University of America in Washington, D.C. She began her legal career as a public defender representing clients in District and Superior Courts in Pierce and Snohomish Counties. In 2000, Piper shifted to a career in politics. She worked for United States Senator Maria Cantwell collaborating on solutions for community leaders and constituents throughout Northwest Washington. Following this policy and outreach work, Piper continued to use her legal skills and experience in government to work for a statewide nonprofit. In 2006, Piper took time to focus on raising her two children. During this time, Piper handled cases pro bono for the King County Bar Association and advocated for children as a Court Appointed Special Advocate. Since moving to Bainbridge Island, Piper has volunteered as a mediator with the Kitsap County Dispute Resolution Center. 
Piper opened her law office in 2014 with the goal to provide legal services specifically tailored to meet the needs of clients in a timely manner. She strives to make a positive difference in lives of her clients through her work. In addition to her private practice, Piper serves as a judge pro tempore for Bainbridge Municipal and Kitsap County District Court. Piper is married to long time islander Jon Thornburgh and together they are the proud parents of Stirling and Charlie.