He was a member of the delegation which took part in the 1980 talks with Sir Stanley Arthur, the UK Government Representative in the Caribbean, at Lancaster House on independence for Antigua and Barbuda.
He has also served two terms in the Senate, and when he stood for the House of Representatives of Antigua and Barbuda in 2004 was the subject of a tied vote.
Both he and his opponent from the Barbuda People's Movement (an ally of United Progressive Party) each received 400 votes.
A by-election was held on April 20 in which Trevor Walker of BPM was elected with 408 votes against 394 for Nibbs.
Outside the political sphere he worked as an assistant air traffic controller at V. C. Bird International Airport on Antigua, and a personnel manager at the K Club.