Susan held a PhD in Political Science at the University of California, Berkeley and went on to teach at Pomona College and Claremont Graduate School before joining the faculty of George Washington University (GWU) in 1991. She worked at GWU until 2016, serving as the Director of the Institute for Global and International Studies at the Elliott School of International Affairs from 2007 to 2012.
Susan was a Professor at the School of Regulation and Global Governance (RegNet, formerly the Regulatory Institutions Network) at the Australian National University from 2016 to 2023.
Susan served on the Board of Geneva-based IP-Watch, a reporting service targeted at under-resourced negotiating delegations and was a consultant for the Ford Foundation, the Open Society Institute, and the World Health Organization. Susan was appointed to the Expert Advisory Group for the United Nations Secretary General’s High-level Panel on Public Health and Access to Medicines for 2015-2016.
Susan also served on the editorial boards of the Review of International Political Economy, European Journal of International Relations, Global Governance, and International Studies Quarterly.