Karin Hess, author of the Hess Cognitive Rigor Matrix, is a former classroom teacher and school administrator with over 40 years of deep experience in curriculum, instruction, and assessment. Dr. Hess is recognized internationally as a leader in developing practical approaches for using cognitive rigor, depth of knowledge, and learning progressions as the foundation for curriculum design and assessments at all levels of assessment systems, from developing local assessment systems to state-level grade-level standards and test specifications for large-scale state assessments. Over the years, she has contributed to Maine’s early thinking about how to structure requirements for assessing high school graduation exhibitions and has provided technical assistance to Science Exemplars in the development and annotation of K-8 science performance tasks (www.exemplars.com), to the Center for Collaborative Education’s Quality Performance Assessment (QPA) initiative, and to Benchmark Education’s Ready to Advance curriculum for Pre-K, using learning progressions in curriculum and assessment design. Her most recent publications include a chapter in the second edition of Fundamentals of Literacy Instruction and Assessment, Pre-K–6 (Hougen & Smartt, Eds., Paul Brookes Publishing, 2020) and A Local Assessment Toolkit to Promote Deeper Learning: Transforming Research into Practice (Corwin, 2018). Karin’s ongoing CBE work has included guiding the development and implementation of New Hampshire’s K–12 Model Competencies and supporting school districts throughout the United States in creating and analyzing the effective use of performance scales and high-quality performance assessments for competency-based learning.