Jeffrey Wilcke is a co-founder of Ethereum; he started the first implementation of Ethereum using Go in 2013. Since then, he's been the lead of Ethereum's Go team.
Ming Chan is the Executive Director of the Ethereum Foundation. She studied Computer Science and Media Arts & Sciences at MIT, and her work focuses on regulatory and legal issues related to blockchain technology.
Gavin Wood is a co-founder and former CTO of Ethereum; he invented the Solidity contract language. He is also the founder and current CTO and Chairman of Parity Technologies.
Vitalik Buterin is the creator of Ethereum. He launched Ethereum by writing the whitepaper in 2013 and remains one of the leading people behind the direction of the project.