- Source of Wealth: Motor Racing, Land, Art
- Age: 61
- Birth Place: Rothesay, Scotland, Great Britain
- Marital Status: Married (Serena Solitaire Wendell)
- Full Name: John Colum Crichton-Stuart
- Nationality: British
- Date of Birth: 26 April 1958
- Ethnicity: Scottish
- Occupation: Race Car Driver
- Children: 4 (Lady Caroline, Lady Cathleen, John Bryson, Lady Lola Affrica)
Scottish peer and a former racing driver, Johnny Dumfries has a net worth of $65 million. In 1984, Johnny Dumfries was crowned British Formula Three champion after winning 14 races. Dumfries, or John Crichton-Stuart, the Marquess of Bute, the Earl of Windsor, Viscount Ayr, Lord Crichton of Sanquhar and Cumnock, Viscount Kingarth, Lord Mountstuart, Cumrae and Inchmarnock, Baron Cardiff and Viscount Mountjoy for short, progressed to Formula One in 1986, where he partnered the late Ayrton Senna at Lotus. It turned out to be his one and only season in F1, as he picked up just three points. He tried endurance car racing next and in 1988 was one of the three-man team that won the Le Mans 24-Hour race. He was taught to drive on his family’s estate on the Isle of Bute, by his late father, the 6th marquess. He retired from racing in 1991. Two years later, Dumfries was left £144m when his father died. After deducting debts of £12m, that left a £131m fortune but the cost of maintaining the 53,000-acre Mount Stuart estate and house on the Isle of Bute has been even dearer than racing cars for a living. There have been regular art sales and Dumfries also sold his secondary residence Dumfries House and its contents for £45m in 2007.