Yvonna S. Lincoln is professor of higher education and human resource development at Texas A&M University, where she holds the Ruth Harrington Chair of Educational Leadership and University Distinguished Professor of Higher Education. She and Egon Guba coauthored foundational works of constructivist social science, such as Effective Evaluation, Naturalistic Inquiry, and Fourth Generation Evaluation. She also edited Organizational Theory and Inquiry, and co-edited (with Norman K. Denzin) four editions of The Handbook of Qualitative Research, the journal Qualitative Inquiry, and several book series.
Egon G. Guba was emeritus professor of education at Indiana University until his death in 2008. A central figure in educational theory and research, he popularized the use of constructivism in education and other social sciences.