Morriss served as an Administrative Law Judge with the Federal Energy Regulatory Commission from August 1996 until her ITC appointment. She previously was an Administrative Law Judge and an Administrative Appeals Judge at the Social Security Administration. Earlier in her career, she served as Associate Chief Counsel, Deputy Associate Chief Counsel, and Counsel to the Chief Administrative Appeals Judge at the Benefits Review Board of the U.S. Department of Labor.

Morriss holds a bachelor of arts degree from Utica College of Syracuse University and received her juris doctor degree from the Washington and Lee University School of Law.

The U.S. International Trade Commission is an independent, nonpartisan, quasi-judicial federal agency that provides trade expertise to both the legislative and executive branches of government, determines the impact of imports on U.S. industries, and directs actions against certain unfair trade practices, such as patent, trademark, and copyright infringement.