Walter W. Powell is Visiting Scholar at the Hertie School of Governance and Professor of Education, Sociology, Organizational Behavior, Management Science and Engineering, and Communication at Stanford University. His interests focus on the processes through which knowledge is transferred across organisations, and the role of networks in facilitating or hindering innovation and the role of institutions in codifying ideas. Powell is also an external faculty member at the Santa Fe Institute and is Faculty Co-Director of the Center on Philanthropy and Civil Society at Stanford. His most recent book, with John Padgett, The Emergence of Organizations and Markets (Princeton University Press, 2012) analyses the role of networks in invention and in catalysing social and economic transformations. Powell has taught at Yale University, Massachusetts Institute of Technology, and the University of Arizona. He holds a PhD in Sociology from SUNY Stony Brook.