Evan Williams is an American entrepreneur best known as a co-founder of the social media platform Twitter. He played a significant role in the development of the platform and served as its CEO during its early years. Williams has also been involved in other tech ventures, including the blogging platform Blogger, which he co-founded and later sold to Google. In addition to his work with Twitter and Blogger, Evan Williams is a venture capitalist and has invested in various startups through his firm, Obvious Ventures. He is recognized for his contributions to the tech industry and his influence on online communication.