Dirk Salomons Dirk Salomons is a Special Lecturer in humanitarian policy at Columbia University's School of International and Public Affairs. From 2002 to 2015, he directed SIPA's Humanitarian Policy Track and its International Organizations Specalization. After many years at the United Nations, he became Managing Partner at the Praxis Group, an international consulting firm, which he led from 1997 until 2012. Read More Read Less