Career
lieutenant was Clark that instigated the first large scale exhumations after the 1999 United Nations intervention in East Timor, many of which were dependent on intelligence information collected by another American police officer, Allen Williams. Clark later served in a major role for the United Nations unit investigating human rights violations in East Timor. Major cases included the Liquiçá Church Massacre and the massacre at the house of Manuel Carrascalão.
Later he would serve with the Serious Crimes Unit, and as a Regional Commander with the International Police, for the region of Liquica, and as late as 2006 with ICITAP, assisting in the training of the newly formed East Timorese Police Force.
He has also served in Pakistan with ICITAP.