Table:
text: United States Ambassador to Trinidad and Tobago
List of ambassadors
List of ambassadors
Name_ Background Title Appointment Presentation_of_Credentials
Brian J. Donnelly Non-career appointee Ambassador Extraordinary and Plenipotentiary July 5, 1994 September 5, 1994
Edward E. Shumaker III Non-career appointee Ambassador Extraordinary and Plenipotentiary October 24, 1997 January 13, 1998
Roy L. Austin Non-career appointee Ambassador Extraordinary and Plenipotentiary October 1, 2001 December 6, 2001
Beatrice Wilkinson Welters Non-career appointee Ambassador Extraordinary and Plenipotentiary April 27, 2010 2010
Margaret B. Diop Foreign Service officer Chargé d`Affaires ad interim October 2012 Unknown

Question: Who presented their credentials to the United States Embassy in Trinidad and Tobago at an unknown time?

Question: Who was appointed United States Ambassador to Trinidad and Tobago on October 24, 1997?