Dr. Sandra Trejos is a Professor of Economics and Assistant Chair for the Business, Economics and Communication Department at Pennsylvania Western University (PennWest) - Clarion Campus and a Costa Rican native who became U.S. citizen in 2018. She has been part of the Faculty at PennWest since 2004 where she received tenure and promotion to full professorship in 2009. Nationally, Dr. Trejos received the Outstanding Latina Faculty: Service/Teaching in Higher Education Award at the 2014 American Association of Hispanics in Higher Education (A.A.H.H.E) Conference in Costa Mesa, California. She earned the 2009 Clarion University Outstanding Faculty Equity Award, and the 2010 Clarion University Faculty of the Year award at the Student-Athlete Luncheon.

In the economics profession, she is part of the American Society of Hispanic Economists, officially recognized by the American Economic Association as one of the affiliated organizations of the Allied Social Science Association (A.S.S.A.), and the Pennsylvania Economic Association (P.E.A.) where she served as the 2011-2012 Vice-President of Publicity, the 2012-013 Vice-president of Program and Proceedings and the 2013-2014 President Designate. She presided the P.E.A. during the 2014-2015 period. She is currently a mentor for the Diversity Initiative for Tenure in Economics (D.I.T.E) housed at Duke University, the American Economic Association Summer Program – Pipeline Conference and the Association for Mentoring and Inclusion in Economics (A.M.I.E.).

Dr. Trejos has received multiple grants for research and professional development at both the college and the university levels throughout the years and was the principal investigator for a grant by the Pennsylvania System of Higher Education. She has been a reviewer for different publication outlets and has presented at conferences nationally and internationally. She has also served as external reviewer for colleagues in the field and has done work for Pearson Publishing and published scholarly work in several peer-reviewed journals in the fields of economic education (as inspired by classroom-based research), international economics, and economic development. Lately, she has worked in the field of happiness economics.

Finally, Dr. Trejos served as judge for the Pennsylvania Junior Academy of Science (P.J.A.S) for six years at both the regional and state levels.