His inaugural speech featured contributions from former Taoiseach Jack Lynch, then Leader of the Opposition Garret FitzGerald and Professors James Meenan and Brendan Walsh.
[14][15] Meenan has heard cases involving personal injuries against the estate of Dolores O'Riordan and a defamation action taken by Gerry Adams against the BBC.
[16][17] In 2017, he overturned a decision of the Data Protection Commissioner which had found that Alan Shatter had acted in breach of his duties while Minister for Justice and Equality.
[18] He found in 2018, that Simon Harris had not taken proper account of reports in his role as Minister for Health in a decision to launch an inquiry into the welfare of patients at the National Maternity Hospital, Dublin.
[22] As of 2020, Meenan is the Judge in Charge of the Non-Jury and Judicial Review List of the High Court.
[23][24] In May 2020, he presided over a hearing in which Gemma O'Doherty and John Waters sought leave for judicial review to challenge the constitutionality of legislation enacted in response to the COVID-19 pandemic.