Harrison Chase co-founded LangChain in 2022 and serves as CEO, building the open-source framework that became one of the most widely adopted tools for chaining prompts, tools, and memory into large language model applications. Before LangChain, he led the entity linking team at Kensho and the machine learning team at Robust Intelligence.
Under Chase, LangChain grew past 20 million installations and reached unicorn status in October 2025 after a $125 million Series B valued the company at $1.3 billion.