Danielle Guzman-Orth is a senior research scientist with the Center for Equity in the Research & Development division at ETS. She earned a Ph.D. in special education at the University of California, Santa Barbara. She specializes in research on validity and fairness with an emphasis on fair, equitable, and accessible opportunities for special populations, including English learners, students with disabilities, and English learners with disabilities. Guzman-Orth conducts foundational research and provides technical assistance for state and consortia clients on their assessment systems and accessibility and accommodations, including monolingual and bilingual accommodations. Her research impact is demonstrated through enhanced equitable and accessible educational designs, instruction, and assessment opportunities for special populations. She has been recognized for her research and service through awards, such as the ETS Presidential Award and California Education Research Association Outstanding Research Award. She is a member of the editorial board for the Journal of Hispanic Higher Education and has authored numerous client reports and publications on accessible assessment in peer reviewed journals, such as Educational Assessment, Language Assessment Quarterly, Journal of Psychoeducational Assessment, and Journal of Educational Psychology, as well as several book chapters published in multiple volumes.