Daniel O'Donnell & Mary Duff Daniel O'Donnell is an Irish singer, television presenter and philanthropist. O'Donnell came to public attention in 1983 and has since become a household name in Ireland and the UK. He has also had considerable success in the US. He also forged a close professional relationship with the Irish singer Mary Duff, who regularly tours with O'Donnell. Together they have released the albums "Timeless" (1996) which reached #13 and "Together Again" which reached #6 in the UK Album Chart.