Jenny Berrill is a Lecturer at the School of Business at Trinity College Dublin. She holds a BA degree in Economics and Finance and a Masters degree in Economics and Finance from NUI Maynooth. She holds a PhD degree in International Business and Finance from Trinity College Dublin. She has previously taught courses in Hong Kong, Australia and Spain as well as University College Dublin and Dublin City University in Ireland. Her research interests are in the area of multinational companies and their role in the international diversification of portfolios. She has published articles in many journals including the Journal of Economics and Business, International Business Review, International Review of Financial Analysis, Thunderbird International Business Review and Research in International Business and Finance. She is Associate Editor of International Review of Financial Analysis.
This paper uses a twenty-year data set of all publicly listed US firms from 1995 to 2014 to create a unique measure of both the extent and the scope of firm-level multinationality.