Cassie has worked with UNICEF and other international agencies to promote policies and programs in support of young children and their families. Over the past 20 years, she has provided technical assistance and support to child development programs in over 60 countries throughout Southern Africa, South Asia, East Asia, Middle East and North Africa, Central Asia and Eastern Europe. A primary focus of her work has been the design and evaluation of programs to support parents and families in their role as primary caregivers. In collaboration with the Open Society Foundations, Cassie has designed a Master degree program in Early Childhood Development, BRAC University, Bangladesh and is a visiting professor at the Moscow School of Social and Economic Studies. She is currently on the faculty of the Mailman School of Public Health, Columbia University and teaches courses in global child development.