A dual national of Jamaica and Belize, she has served in legal positions in various countries for three decades.
From 2002 to 2008 she served with the Commonwealth Secretariat in London, before returning to the Caribbean to take up a position as CARICOM's general counsel.
There was a question over her eligibility to hold the position of SG, as she did not fulfill the requirement of being enrolled for eight years as an attorney at law in Belize or elsewhere in the Commonwealth.
[2][5] In December 2011, the Belize Bar Association filed a formal court challenge to Krusen's eligibility.
[2] Krusen attended the University of the West Indies at Cave Hill, Saint Michael, Barbados, receiving her LL.B.