Jesse Powell

CEO of : Kraken Company valuation : $ 20bn

California State University philosophy graduate , Jesse Powell , began dabbling in cryptocurrency in 2001 and then created a company that helped online gamers with in-game currencies . A massive fan of the arts , he also founded the Verge Gallery in Sacramento - the state ’ s largest modern art gallery . But his true passion was Bitcoin and he launched Kraken in 2013 . It is now the second-largest cryptocurrency exchange in the US after Coinbase .

Sebastian Siemiątkowski

CEO of : Klarna Company valuation : $ 31bn

Swedish native Sebastian Siemiatkowski , launched his revolutionary payment service app , Klarna , back in 2005 . A totally new concept at that time , 39-year-old Siemiątkowski ’ s determination to see his innovative product work , was viewed with suspicion and derision by some members of the financial industry . But today , he is a leader of his niche - and the ‘ buy now pay later ’ phenomenon that has literally gone global .