16, 17 & 18. Charles Rolls, Tim Warrillow, and Charles Gibb — The cofounders and North American CEO of Fever-Tree

"If 3/4 of your drink is the mixer, mix it with the best." This is the belief of Charles Rolls and Tim Warrillow, the cofounders of upmarket tonic brand Fever-Tree, which has been reaping not only the benefits of the continued gin renaissance, but also of putting as much importance in the mix and people historically have done in their choice of spirit.

Fever Tree launched in 2005 with the aim of providing "high-quality mixers" to cater for the growing demand of premium spirits — gin in particular.

In 2017, Rolls proved the brand's success when he made £73 million ($95 million) by selling 3.9% of the shares in the company. Both founders then made a further £103.5 million ($131.8 million) when they sold another round of shares last year.

The brand's revenue stood at £102.2 million ($130.2 million) in 2016, up 73% from £59.3 million ($75.5 million) in the previous year.

Now, the brand is looking to dominate North American under the leadership of former British Army captain Charles Gibb, who will run the brand's first ever global office from Brooklyn, New York City. They should be in safe hands — in his role as CEO of LVMH's Belvedere Vodka, he managed to make the brand the official vodka of James Bond film "Spectre."

Read more: The founder of Fever Tree tonic water just made £73 million by selling shares