Thomas Alfred Shannon Jr. (1958–)

Career Foreign Service Officer
State of Residence: Virginia

1. Assistant Secretary of State for Western Hemisphere Affairs
   Appointed: October 12, 2005
   Entry on Duty: October 17, 2005
   Termination of Appointment: November 10, 2009
2. Ambassador Extraordinary and Plenipotentiary (Brazil)
   Appointed: December 29, 2009
   Presentation of Credentials: February 4, 2010
   Termination of Mission: Left post on September 6, 2013
3. Career Ambassador
   Appointed: September 26, 2012
   
4. Counselor
   Appointed: December 24, 2013
   Entry on Duty: December 24, 2013
   Termination of Appointment: February 12, 2016
5. Under Secretary of State for Political Affairs
   Appointed: February 12, 2016
   Entry on Duty: February 12, 2016
   Termination of Appointment: June 4, 2018
6. Secretary of State ad interim
   Appointed: January 20, 2017
   Termination of Appointment: February 1, 2017
   • Under Secretary of State for Political Affairs; Acting Secretary of State