Meet the Leadership Team

Nancy McEldowneyNancy McEldowney, Director of MSFS, was appointed to her new position on July 1 of this year. Previous to MSFS, she served as Director of the Foreign Service Institute (FSI) and Ambassador to the Republic of Bulgaria.

As Director of FSI, Ambassador McEldowney led the foreign affairs training facility for the U.S. government, which offers 800 courses and enrolls approximately 170,000 annually.  She was responsible for FSI’s 1,400 staff, worldwide field operations, and $130M operating budget. Ambassador McEldowney also served as Interim President and Senior Vice President of the National Defense University, the U.S. Department of Defense’s national security university.

Ambassador McEldowney has been a leading policy advisor on Europe. She served President Clinton as Director of European Affairs on the White House National Security Council Staff. She also served as Principal Deputy Assistant Secretary in the Bureau of European and Eurasian Affairs, where she led the U.S. government engagement with NATO, the European Union, and the Organization for Security and Co-operation in Europe (OSCE).

Ambasador McEldowney’s distinguished career as a foreign service officer included positions as U.S. Ambassador to the Republic of Bulgaria and as Chargé d’Affaires and Deputy Chief of Mission in Turkey and Azerbaijan.

She has been granted the State Department’s Superior Honor Award on five occasions. She is also the recipient of the Sinclair Linguistic Award and of the Chairman of the Joint Chief’s Joint Distinguished Civilian Service Award.


Rachel Yang Antoun, Assistant Director of External Affairs, works closely with Associate Director in developing relationships with external organizations in the public, private, and nonprofit sectors in the U.S. and abroad. In addition, she provides support to students in all aspects of their internship search by conducting workshops on internship and career searches, holding one-on-one advising sessions, providing written recommendations, and more. She also organizes MSFS DC Days and the NYC Trip.  

Before joining the MSFS program, Rachel worked at the University of Michigan as the Program Coordinator in their Confucius Institute and most recently as the Graduate Coordinator serving PhD students in the Electrical Engineering and Computer Science department. She has also spent a considerable amount of time living and working abroad, namely in Taipei, Taiwan and Beijing, China.  

Rachel earned her M.A. in Higher Education from the University of Michigan and a B.A. in International Affairs from James Madison University.


Erin E. Guild, Associate Director, oversees academic and alumni affairs for the Master of Science in Foreign Service program. In addition to supporting students, faculty, and alumni, Mr. Guild supports the efforts of the MSFS Advisory Board as it serves to strengthen the program's academic and professional opportunities. Mr. Guild works closely with the Director of Academic Affairs, the Assistant Director of External Affairs, and the Communications and Events Coordinator. He also serves on the MSFS Admissions Committee.

Prior to joining the MSFS program, Mr. Guild served as Director of Admissions and Registrar to the School of Advanced International Studies of The Johns Hopkins University. He has worked in institutions of higher education since 1997. Prior to that, Mr. Guild worked as an aide on the United States Senate Committee on Labor and Human Resources.

Mr. Guild earned his Bachelor of Arts degree from the State University of New York at Binghamton. He earned a Master of Science in Student Affairs in Higher Education degree from Colorado State University and a Master of Public Relations & Corporate Communications from Georgetown University. Mr. Guild is currently pursuing his doctorate in Education with an emphasis in College and University Leadership.


Mei-Ling Klein, Assistant Director of Finance and Administration, is responsible for the oversight and management of all program funds, human resources administration, and facilities and technology management.

For nearly three years, Mei-Ling served as the Program Administrator for the Global Human Development Program at Georgetown. Prior to coming to the School of Foreign Service, she held several administrative positions in the McDonough School of Business. Before Georgetown, Mei-Ling spent a decade in Switzerland in a variety of academic administrative positions, including Associate Director of External Relations and Director of Admissions at the Leysin American School and Director of Annual Giving at the American School of Switzerland. She also served for seven years as the Director of Admissions and Financial Aid at the American School in Japan. Mei-Ling holds an M.S. in Business Education from the University of Southern Illinois and a B.A. in English Literature from Tamkang University in Taiwan.


Sarah Krauss, Director of Academic Affairs, works with faculty and students on course offerings, registration, degree requirements, and progress toward graduation for the program. She serves as academic advisor for students pursuing joint degrees with MSFS and works closely with the MSFS Student Representatives to enhance the student experience. Sarah also manages the MSFS Oral Exams and New Student Orientation. 

Before MSFS, Sarah spent four years working in the Office of Undergraduate Studies at The George Washington University, most recently as Associate Director. Prior to her time at GW, Sarah worked at the Center for Academic Advising and First Year Programs at Lasell College and previously served in the Office of Career Services at the Fletcher School of Law and Diplomacy at Tufts University. Sarah holds an M.Ed. in Higher Education from Harvard University and a B.A. in English Literature and Philosophy from the University of Vermont.


Kristen Voorhees, Events and Communications Coordinator, oversees and implements strategic communications for the MSFS program. Additionally, she coordinates and manages events held by MSFS, including orientation and graduation. Kristen is the advisor to the programs' student groups. Before joining MSFS, Kristen worked as Outreach Coordinator for Counterpart International, a global development non-governmental organization operating in more than 25 countries on issues including civil society and governance, nutrition, access to education, and climate resiliency.

Kristen earned her Bachelor of Arts degree in Political Science with a focus on International Relations from Binghamton University in New York. She completed her Masters of Public Administration with a focus on International Development from The George Washington University. 


Concentration Chairs

Nicole Bibbins SedacaProfessor Nicole Bibbins Sedaca - Chair, Global Politics and Security

Professor Bibbins Sedaca is Professor in the Practice of International Affairs and Concentration Chair for Global Politics and Security. At MSFS, Professor Bibbins Sedaca teaches courses in policy innovation, ethics and decision making, and religion and international affairs. 

Prior to joining the MSFS leadership team, Prof. Bibbins Sedaca served in a variety of roles in the US Government, non-governmental organizations, and academia.  Most recently she directed the Washington DC office of a diplomatic advisory group, called Independent Diplomat.  She served as an adjunct professor in Georgetown University’s Master of Science in Foreign Service (MSFS) program from 2010 until joining MSFS full-time. She also served in the U.S. Department of State from 1997 – 2007 on a range of issues including democracy promotion, human rights, refugee issues, counterterrorism, and human trafficking. Most recently she served as Senior Director for Strategic Planning and External Affairs for Democracy, Human Rights and Labor, as well as Senior Advisor to the Under Secretary of State for Democracy and Global Affairs. Following her government service, she launched and directed the International Republican Institute’s local governance program in Ecuador, and also taught at the Universidad San Francisco de Quito in Ecuador.  

She earned her Master of Science in Foreign Service from Georgetown University and Bachelor of Art in International Relations from The College of William and Mary. She also studied at Humboldt Universitaet in Berlin, Germany, while on a Rotary International Scholarship. She chairs the board of the International Justice Mission, and has also served on the Boards of the Institute for Global Engagement, Georgetown University’s School of Foreign Service, the William and Mary Washington Office, and the Fund for William and Mary.


Professor Erwin Tiongson - Chair, International Development and Deputy Director of the MSFS Program

Prior to joining Georgetown in 2014, Erwin was a Senior Economist at the World Bank and served in the Europe and Central Asia Region and, more recently, in the Latin America and Caribbean Region. He first joined the World Bank in 2003 through its Young Professionals Program. He also served as staff member of the International Monetary Fund from 1997-2003 and served as Associate Professor at the Asian Institute of Management from 2009-2011, where he remains a Nonresident Research Fellow. He is a Research Fellow of Das Institut zur Zukunft der Arbeit (IZA) (Institute for the Study of Labor), External Research Fellow of the Centre for Research and Analysis of Migration (CReAM) at the University College London, and Senior Fellow of the Institute for the Study of International Migration (ISIM).

Erwin holds a Ph.D. and an M.Phil. in Economics from The George Washington University, an M.P.P. from Georgetown University, an M.A. in Economics from Fordham University, and a B.A. in Philosophy from the Ateneo de Manila University. He was born and raised in Nueva Vizcaya, Philippines.


Professor David Wallis - Chair, Global Business and Finance

Professor Wallis is Professor in the Practice of International Affairs and Concentration Chair for Global Business and Finance, MSFS.

Prior to joining the MSFS leadership team, Professor Wallis engaged in a global business career working within the financial services industry. This experience was geographically based in London, New York and Tokyo and has included senior executive positions in insurance, investment banking and asset management. Specifically within the insurance industry, Professor Wallis was the Chief Risk Officer and subsequently President and Chief Executive Officer of Ambac Inc., a New York Stock Exchange Company where he also sat on the Board of Directors. Subsequently Professor Wallis worked at AIG both in New York and Tokyo, and was latterly responsible for AIG’s Regional Financial Planning & Analysis Groups based in Tokyo.

Professor Wallis holds an Honors Degree in Economics from Downing College, Cambridge, an MBA from the City University Business School, London and attended the Program for Manager Development at the Fuqua School of Business, Duke University. He also qualified MCT under the Association of Corporate Treasurers in the UK. Professor Wallis served as an Adjunct within Georgetown’s MSFS program in 2012 and 2013.