Marek is a co-founder of Celo, an emerging Ethereum Layer 2 with a rich ecosystem of global partners building Web3 applications that help create a more inclusive global financial system. He is also the CTO of cLabs, a mission-focused blockchain technology organization supporting the Celo network and ecosystem, and President of Valora, an easy-to-use mobile wallet built on Celo. Earlier, he co-founded Locu, a venture-backed machine-learning company acquired by GoDaddy, and previously worked at Google, Microsoft Research, and Sun Labs.

Marek is a former Ph.D. student at MIT; he is an alumnus of the University of Toronto and is a former Facebook Fellow.