David L. Morgan is a professor in the Department of Sociology at Portland State University. He is an inter-disciplinary research methodologist, who is widely known for his work on focus groups, including his books, Focus Groups as Qualitative Research, and Basic and Advanced Focus Groups with SAGE. He has also worked extensively on mixed methods, including a book for SAGE, Integrating Qualitative and Quantitative Methods. In addition, he has also published Essentials of Dyadic Interviewing for Routledge. He is currently the series editor for the Qualitative Research Methods Series (“little blue books”).