Harrison Chase is co-founder and CEO of LangChain, the company behind the widely used open-source framework of the same name for building applications with large language models. He started LangChain as an open-source project in late 2022 and built it into a company that also offers LangGraph for agent orchestration and LangSmith for observability. He is known for popularizing patterns around LLM agents and tool use, and more recently for promoting “deep agents” and “ambient agents.” LangChain raised a Series B in October 2025 at a valuation reported around $1.25 billion.
Recent
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2026-06-28 Tweeted on building reliable agents: emphasized repeatable improvement lifecycles over one-off prompt tweaks, linking back to LangSmith traces as the ground truth for agent behavior. X
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2026-06-06 Shipped LangChain Engine: an agent that mines LangSmith production traces, patches agent code, and sets up evals autonomously. LangChain Blog