Spiros Papageorgiou is a Principal Measurement Scientist in the Research Division at Educational Testing Service (ETS), in Princeton, New Jersey, USA. Spiros received his doctoral degree in linguistics specializing in language testing from Lancaster University, UK. Prior to joining ETS, he worked as a researcher and a program manager at Michigan Language Assessment. At ETS, Spiros conducts research on the assessment of English as a foreign language and is involved in the coordination of the TOEFL internal research program, as well as the external research program supported by the TOEFL Committee of Examiners (COE). Spiros has published over 50 journal papers, book chapters, and technical reports on topics such as standard setting and score mapping to proficiency levels, score reporting and interpretation, and listening assessment. His recent projects include the mapping of the TOEFL iBT test scores to the China Standards of English Language Ability (CSE), conducted in collaboration with the National Education Examinations Authority (NEEA), and TOEFL Steps, a research-based tool that demonstrates the learning path for the TOEFL Family of Assessments. Spiros is the co-editor of the edited volume Global Perspectives on Language Assessment: Research, Theory, and Practice, co-published in 2019 by TIRF and Routledge, and the edited volume Meaningful Language Test Scores: Research to Enhance Score Interpretation, published in 2023 by John Benjamins. Spiros was the recipient of the Robert Lado Memorial Award by the International Language Testing Association (ILTA), and the Jacqueline Ross TOEFL Dissertation Award by ETS. He has also been an active member of the language testing community, having served as member-at-large of the Executive Boards of ILTA and the Midwest Association of Language Testers (MwALT). He currently serves on the Board of Trustees for TIRF, The International Research Foundation for English Language Education.