Charles Hoskinson is an American philanthropist and entrepreneur. He is a co-founder and CEO of the blockchain engineering company Input Output (IO), and co-founder of the Ethereum blockchain platform.

Founded in 2015, Input Output is the leading infrastructure and research engineering firm dedicated to building a sustainable Web3 ecosystem. Fully decentralised remote working organisation committed to the highest principles of academic rigour and evidence-based software development.

The company builds high-assurance blockchain infrastructure solutions for the public, private sector, and government clients. It is also one of the driving force behind the decentralised and smart contract platform, Cardano, as well as the upcoming Midnight blockchain.