Ambassador Miller has served as Chair of ICMP’s Board of Commissioners from 2011 to 2023. He also serves on the boards of Partnership for a Secure America (promoting bipartisanship in US foreign policy), and Lampsa (a Greek hotel company). From 2005 through 2008, he served as CEO of Plan International, a non-governmental organization that works in 66 countries to improve the lives of children in developing countries. From 2010 through 2018, Ambassador Miller was President/CEO of International Executive Service Corps, a non-profit that provides expertise to developing countries to train in best business practice.

Ambassador Miller spent 29 years as a diplomat.  From 2001 to 2004, he was the US ambassador to Greece, where he focused on security concerns related to the 2004 Olympic Games in Athens. From 1999 to 2001, as US Ambassador to Bosnia and Herzegovina, he worked on post-conflict recovery.  From 1997 to 1999, he was Special Coordinator for the Cyprus negotiations (with the rank of ambassador).  He was also posted to Thailand. At the State Department in Washington, Ambassador Miller focused on North Africa, the Middle East, and counter-terrorism issues.

A native of the Chicago area, Ambassador Miller holds five degrees, including a Ph.D., from the University of Michigan.