Karen Maas completed her Master of Science in Economics at the Erasmus University in 1995. After her graduation, she worked for 12 years as a Senior Consultant and project leader in the field of environmental economics, sustainability and corporate social responsibility (CSR). Since September 2007, Maas has worked at the Erasmus School of Economics at the Erasmus University Rotterdam, and in 2009 she defended her PhD research on “Corporate Social Performance: from output level to impact level.” She works as an assistant professor at the Erasmus School of Economics, Business Economics department, and at the Erasmus Centre for Strategic Philanthropy (ECSP) and the Erasmus Social Entrepreneurship Centre (ESEC). Maas conducts research in the field of impact measurement, CSR, and strategic philanthropy. She is Scientific Director of the executive CSR courses at the Erasmus School of Accounting & Assurance, and is a member of the Advisory Board of the Erasmus Education Fund