[4] He distinguished himself in private practice as a Barrister-at-Law and Solicitor throughout the Leeward Islands, with Chambers in Saint Kitts, Nevis and Anguilla from 1966 to 1982.
[7] As Acting Chief Justice, Judge Byron made the establishment of the Eastern Caribbean Supreme Court Judicial Reform Programme a matter of high priority.
These new Rules, tailored to the norms of the Eastern Caribbean, are in keeping with the ethos of judicial case management which informs the Woolf Reforms instituted in England in 1998.
With these reforms, he set a three-fold objective, namely, the enhancement of public access to the Court by simplifying procedures, the reduction of the delay of litigation from start to finish, and the inculcation of a higher standard of professionalism at the Bar.
[10] At the invitation of then-Secretary General of the United Nations Kofi Annan, Judge Byron, while serving as Chief Justice of the Eastern Caribbean Supreme Court, from which position he retired, became a permanent Judge of the United Nations International Criminal Tribunal for Rwanda (ICTR) in 2004.
[11][12] The ICTR was established by the United Nations Security Council to try war crimes committed during the Rwandan genocide of nearly 1 million people in 1994.
He provided the dedicated leadership and commitment for the realization of the Tribunal's overall Completion Strategy without sacrificing any of the vital safeguards of due process and fair trial rights.
[15] In an interview with Radio Netherlands Worldwide, Sir Dennis Byron highlighted two judgments of the ICTR as trend-setting in international law.
[19] As President, he also oversaw the strategic planning initiatives of the CCJ, and introduced several measures to enhance the efficiency of the case management processes.
He is also credited with rendering the internal operations of the Regional Judicial and Legal Services Commission (RJLSC) more efficient and productive.
He is regularly invited to speak on a wide range of topics including the rule of law, the use of technology to enhance access to justice, alternative dispute resolution, judicial training and legal ethics.
[21] Sir Dennis Byron was appointed to serve as a Member of the Constitutional Review Commission of the British Virgin Islands in 2022.
In this capacity he participated in several public consultations throughout Dominica to listen to and collate the concerns of all stakeholders, and he then provided comprehensive recommendations to be made to enhance, strengthen and modernise the electoral process.