Brien started off riding ponies, hunting and show jumping at the tender age of 8. From there he went on to working with racehorses at 15 years of age. Brien then went on to Australia in 2014 where he rode as a conditional- he spent 1 jump season there. He then came home and spent some time in Juddmonte. Brian started with Gavin in March 2015 and has had about 150 rides and 19 winners -16 of those being for the boss.