From 2012 to 2014 he was a panellist on the RTÉ television programme Dragons' Den, in which he was one of the investors adjudicating business plan pitches.

His mother Patsy Casey was deputy headmistress at Nazareth House Primary School and his father Leo was bursar at St Columb's College.

Casey attended both schools before studying business administration, politics, and economics at Aston University in Birmingham.

[3] He suffers from degenerative disc disease and has been prescribed medical cannabis to counteract the nausea he experiences when taking opiates.

Claddagh Resources place high-level executives across the globe for many Fortune 500 companies including Coca-Cola, SAP, Tata Consultancy Services, Oracle, IBM, and EY.

[7] In a twitter post during his campaign for the 2024 European Parliament elections, Casey admitted to working illegally in America for 18 months.

[8] Ireland's version of the business-related TV programme Dragons' Den selected Casey to appear as an investor for the show's fifth and sixth series.

When pressed to name a constituency he thought he might select Donegal, where he had recently purchased a home, or somewhere in Dublin, where he intended to set up his latest business.

At his Seanad campaign launch he said he intended to support foreign direct investment, indigenous business development and job creation.

[15] He criticised incumbent President Michael D. Higgins for "extolling the virtues" of Fidel Castro and Hugo Chávez.

Casey described Irish Travellers as "basically people camping in someone else's land" who are "not paying their fair share of taxes in society".

[19] Casey visited the Thurles housing development for himself on 18 October, under Garda protection, and faced demonstrations by Traveller activist groups.

[30] In May 2019 while making a speech in Dunboyne, County Meath during the campaign, Casey was filmed declaring "The face of Ireland is changing.

When questioned about this statement on The Floating Voter Podcast, a series run by the Irish Independent he said that he makes “no apologies” for describing himself as a racist and continued to criticise the EU's policies on migration.

[44] Writing in the Sunday Independent, he told how credit ratings agencies made Ireland's financial crisis "explode" and suggested how it might be stopped from happening again.