Starting in July 2008, he was deputy chief of mission in Ankara, Turkey, and in 2010 he was charge d’affaires for the embassy there. During his time Turkey, Silliman and his wife Catherine appeared on Turkish television, showing viewers what went into an American Thanksgiving dinner.
In July 2011, moved on to Baghdad as councilor for political affairs. He was named deputy chief of mission and charge d’affaires in 2012, a post he held until his nomination as ambassador to Kuwait.
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