Mullin was educated at one of the leading Irish schools rugby nurseries Blackrock College, Dublin. A Leinster and Ireland schoolboy international, Mullin went on to further education at Dublin University and also earned Rugby blues whilst at Oxford University.
During the early part of his year, Brendan earned the nickname "Guineys" (the name of a 'fashionable' Dublin menswear boutique at the time) which reflected his languid but highly skilful footballing abilities.
Mullin was a noted hurdler, with a personal best of 14.41 seconds for the 110m hurdles.
Mullin had 56 caps for Ireland, scoring 17 tries and 1 conversion, 72 points in aggregate. His debut was at the 9-16 loss to Australia, on 10 November 1984, in Dublin, and his final cap was at the 36-12 loss against France, on 10 June 1995, at the 1995 Rugby World Cup, in Durban, South Africa.
Mullin works in financial services.
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