They debuted in August 2007 at The Helix in Dublin. Accompanied by the Celtic Concert Orchestra under the direction of David Munro, the musical director of the group, Celtic Thunder have become a household name all around the world, with recent ventures into Australia & South Africa.

With airing of their first Public Television special in 2008, Celtic Thunder consistently remains one of the most popular musical shows for stations throughout the US. Hailed as BILLBOARD's Top World Music Artist, Album & Imprint of 2009 & 2011, the phenomenon that is Celtic Thunder has achieved sales of over Two Million copies and 500,000 Ticket Sales to date. Their mass appeal and devoted fan base continues to grow with impressive statistics to prove it. Celtic Thunder's official YouTube channel, "Thunder Tube" has seen over 30 million upload views since the channel's inception in summer 2008.

Celtic Thunder live shows are known for dramatic effects via lighting and choreography as well as realistic Irish stage sets with authentic Irish instruments. The performances have dramatic solos, compelling ensembles, and comedic acts. Celtic Thunder is viewed by millions on PBS with record number of sold out shows. Celtic Thunder has performed on the CBS Saturday Show's Second Cup Café, the Today Show as well as the White House for President and Mrs Obama at their St. Patrick's Day celebration as well as a Regular Guest on QVC.

Celtic Thunder has played such illustrious venues as the Nokie-LA Live in Los Angeles, Radio City Music Hall and the Beacon Theatre in NY, the Agganis Arena and Wang Center in Boston and has performed at the White House for President Obama, as well as functions for Irish Premier Brian Cowen, NYC Mayor Michale Bloomberg, UN Commissioner for Human Rights Mary Robinson, the US troops of the 69th Regiment, and at the opening of a Boston Celtics in TD North Bank Garden game by singing the American national anthem!