Born in Elderslie, Renfrewshire, Scotland, he is the oldest son of Anna Mackintosh (née Blackwood), CEO and owner of the Blackwood Distillery and Robert Mackintosh, a dentist. He has a younger brother, Mark.
He started his schooling at Wallace Primary School at the age of three, transferring to Castlehead High School at the age of eleven, where he remained until he was eighteen.
Then, in 2004 he moved to St. Andrew were he began his studies in Management at the University of St. Andrews.After he graduated, he began working with his mother at the distillery.
In 2006 he met Lady Eleanor McClaire, daughter of the 7th Duke of Wiltshire at St. Andrews while they were both doing an optional course in Medieval British Laws. He studied Management. After two years as friends, they began dating. They dated for six years before breaking up in late 2014.