Thanos is a senior associate for the National Center for the Improvement of Educational Assessment. He has a part-time appointment as a research scholar at Fordham University Graduate School of Education.
He is past president of the Northeastern Educational Research Association (NERA), past Executive Committee Member of Division 5, former editor of the National Council on Measurement in Education (NCME) Newsletter, and current head of the psychology division of the Athens Institute for Education and Research.
He has been a reviewer for Educational and Psychological Measurement, Educational Measurement: Issues and Practice, International Journal of Testing, Mental Measurements Yearbook, and Psychological Methods and on the editorial board of Applied Measurement in Education. He has published and presented over 50 papers. He has served on an APA Task Force for the Recruitment of Quantitative Psychology Professionals.
He founded the College Board Internship Program to facilitate the training and experience of undergraduate and graduate students in quantitative psychology and educational research. He was received awards for his contributions to the College Board in 2001, his teaching at Fordham University Graduate School of Education in 2012 and the Thomas F. Donlon Memorial Award for outstanding mentoring from the Northeastern Educational Research Association in 2013. He is a fellow of APA Division 5.