Formerly Deputy Solicitor-General and principal of the Norman Manley Law School, Vasciannie served as Jamaica's Ambassador Extraordinary and Plenipotentiary to the United States until he stepped down to return to academic life.

Vasciannie was one of the founding members of the National Democratic Movement (NDM) along with former Prime Minister of Jamaica Bruce Golding.

[1][2] Preceding the People's National Party victory in the 2012 general election Vasciannie was named Jamaica's ambassador to the United States in June 2012, and succeeded Jamaican businesswoman Audrey Marks, who was appointed under the Golding administration.

[5] He was appointed principal of the Norman Manley Law School in July 2008 after the death of Keith Sobion.

[6] In 2010, Anglican Diocese of Jamaica Bishop Alfred Reid wrote to him to ask him to serve as chairman of the board of governors of Kingston College, which he accepted, succeeding Crafton Miller.