Phoebe Schreiner is a program officer with the International Women's Program of the Open Society Institute, where she has served since 1999.

Beginning in 2002, Schreiner conducted IWP's advocacy work on women's rights in Central Asia, the Caucasus, and Mongolia, as well as provided technical assistance and capacity building for women's organizations in those countries. More recently, Schreiner has helped guide IWP's exploratory work in Southeast Asia and provided expertise on advocacy and grant-making. Schreiner has spearheaded IWP's international advocacy via the United Nations, including monitoring mechanisms for women's rights and providing recommendations on entry-points to women's groups on the ground, ensuring their effective engagement and advocacy in the international system, both at home and abroad.

From 2001–2006, Schreiner managed and implemented a media-for-advocacy project in the former Soviet Union, to equip women's rights organizations with new tools to address burning women's rights violations in the region. From 1997–1999, she worked as a legal assistant for one of the largest international law firms, Morgan Lewis & Bockius, LLP, based in New York. In 1995, Schreiner worked with the National Organization for Women, a DC-based lobbying group, to assist in advocacy on women's reproductive health and rights and U.S. domestic violence policy, and before that, the International Planned Parenthood Association. She has also been an independent volunteer fundraiser for the Women's Commission for Refugee Women and Children (New York, NY) and Center for Anti-Violence Education (Brooklyn, NY). She is a member of the United Nations NGO Committee on the Status of Women, the Association of Women's Rights in Development (AWID), and Emily's List. Schreiner earned her Bachelor of Arts from Smith College with a double degree in Government and Women's Studies. She is currently earning her Master's degree part-time in International Law and Human Rights at Columbia University.