Originally from Barnsley in Yorkshire, Donald is a member of the famous Whitaker showjumping dynasty – his father is Stephen, brother to John and Michael. Like the rest of the family, he starting riding as a child and has been competing – and winning – in showjumping classes for as long as he can remember. Early successes came at the Horse of the Year Show, including in the puissance class. In 2018, Donald took silver at the Young Horse World Championships in Lanaken, Belgium with the mare Chilli.
Donald's first CSIO5* Nations Cup appearance was in Abu Dhabi in 2022, where he jumped an impressive double clear with Di Caprio to held Britain finished third.
His senior championship debut came in 2023, where he and Di Caprio competed as individuals at the FEI Jumping European Championship.
Currently, Donald is based at Hofgut Dagobertshausen equestrian centre in Germany, which is the family home of his partner, German showjumper Nicola Pohl.