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School of Arts and Sciences

Graduate School Leadership

Robert CookBárbara M. Brizuela
Dean of the Graduate School of Arts and Sciences
Dean of Academic Affairs for Arts and Sciences
Professor of Education

As Dean of the Graduate School of Arts and Sciences, Bárbara supports all GSAS programs and serves as the liaison between students, faculty, and administration on all aspects of graduate education within the school. This includes strengthening the quality and diversity of the graduate student body and integrating career and professional development training into our students’ education. 

Before becoming Dean of GSAS, Bárbara served as a Dean of Academic Affairs for Arts and Sciences from 2014 to 2021 and as an Associate Dean for Diversity and Inclusion for Arts and Sciences from 2019 to 2021. She began her career at Tufts in 2001 as an Assistant Professor in the Department of Education. She was promoted to Associate Professor in 2007 and to Professor in 2015. She is also affiliated with the interdisciplinary Cognitive Studies PhD program. She served as Chair of her department from 2009-2012 and as Director of the STEM Education program from 2009-2014. Her current research focuses on children’s learning of elementary mathematics, including algebraic reasoning and other notational aspects of mathematics, as well as mathematics teachers’ learning and professional development. Her main areas of interest are mathematics education, early childhood education, and cognitive development. 

Bárbara received an MA from Tufts in Education and her EdD from Harvard University. She has published over 100 peer-reviewed journal articles, book chapters, conference proceedings, books, and edited volumes. Her research has been published in English, Spanish, and Portuguese, and she has presented her work around the world. Her research has and continues to be funded by the National Science Foundation and the Spencer Foundation, among others, and she has also been a Fulbright Scholar.


Sarah HerchelSarah Herchel
Associate Dean of the Graduate School of Arts and Sciences

Affiliate Faculty, Department of Education

Associate Dean Sarah Herchel works to foster excellence, inclusion, and innovation at the Graduate School of Arts and Sciences. As a member of the strategic leadership team, she partners with faculty to create training and development opportunities, identifies areas for new academic programs, and is the liaison for the School’s accreditation efforts.   

Sarah has a deep knowledge of higher education administration, and of graduate education in particular. Prior to arriving at Tufts in 2013, she held positions at Boston University’s Questrom School of Business and at Babson College’s F.W. Olin Graduate School of Business. She has an MA in English from Lehigh University, an EdM from Boston University, and a PhD in Educational Studies from Lesley University. Her research interests include adult learning, assessment, and higher education administration.


Jacqueline DejeanJacqueline (Jackie) Dejean
Associate Dean, Diversity & Inclusion, Graduate School of Arts and Sciences
Associate Dean of Research for Arts and Sciences

Jackie Dejean assumed the role of assistant dean of diversity and inclusion for the graduate school in 2019, was promoted to associate dean in 2022, and is focused on advancing the strategic plan for diversity, equity, inclusion, and justice for the School with a special focus on supporting graduate students.

In addition, she has served as assistant dean of research for Arts and Sciences since 2017 where she is tasked with advancing the strategic research agenda of the School and developing programs and initiatives to achieve strategic goals. Under Jackie's leadership, we have launched new initiatives, most notable of which is the VERSE Program.

Previously, she held positions as director of research affairs and medical college associate vice president of grants and research. She has spent over 20 years in the field of research administration at teaching, research, and medical institutions. Jackie has a deep professional and personal commitment to civic engagement efforts focused on diversity and inclusion. She completed her doctorate in law and policy (DLP) at Northeastern University. She holds an AB from Brown University and a master’s in organizational psychology from William James College (formerly the Massachusetts School of Professional Psychology).