Niall Mac an tSionnaigh
Sebastian Siemiatkowski
TOP 100 LEADERS
30
Niall Mac an tSionnaigh
CEO
SumUp
Industry : Fintech
29
Sebastian Siemiatkowski
CEO
Klarna
Industry : Fintech
Niall
Mac an tSionnaigh serves as Chief Operating Officer at SumUp Ltd , following leadership positions at LinkedIn and Deloitte . He holds a Master ’ s in International Business , International Management , Economics and Business Strategy . At SumUp , he oversees operational strategy , focusing on operational excellence and customer experience across the payments technology firm ’ s global operations .
Sebastian
Siemiatkowski serves as CEO of Klarna , the Swedish payments firm he co-founded . Born in Uppsala to Polish parents in the early 1980s , he benefited from Sweden ’ s computer subsidy programme , which enabled his early exposure to technology . Under his leadership , Klarna has become a leading force in Buy Now , Pay Later technology for e-commerce .
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