[5] His involvement with the European Court of Justice began in 1990, where he served as référendaire to Irish judges Tom O'Higgins and John L.
[2] He is the co-author of a legal text Civil Proceedings and the State and edited the Irish Journal of European Law between 1992 and 2001.
[6][7] He is an adjunct professor of University College Cork and a bencher of the King's Inns.
[10] The Irish government put in place a panel of Paul Gallagher, Nial Fennelly and former ambassador Marie Cross to nominate a person to serve the remainder of Hogan's term to 8 October 2024.
[12] Collins was nominated by Taoiseach Simon Harris's government as a judge of the Court of Appeal on the 31st of October 2024 and was appointed by President Michael D. Higgins on the 1st of November 2024.