[1] Vincent began her career with the U.S. Department for State, which she joined in 2005, immediately after completing her bachelor's degree in political science from the University of North Texas.

Vincent also spent time as a political reporting officer at the US Mission to the United Nations in New York in 2008, covering proceedings of the 63rd General Assembly and the Third (Social, Humanitarian, and Cultural) Committee.

[13] Vincent has led the organisation's campaigning in the cases of Daphne Caruana Galizia,[14] Christopher Allen,[15] Julian Assange,[16] Jimmy Lai,[17] and others.

She is a member of the steering committee of the Hold the Line Coalition, which was launched to campaign in support of Maria Ressa and independent media in the Philippines.

[19][20] In April 2023, Vincent and Reporters Without Borders' Secretary-General Christophe Deloire were barred access from Belmarsh Prison, where they attempted to visit Assange.