Jan LeikeMember of Technical Staff · AnthropicResearcher↗
Researcher · Engineer
AnthropicEngineer-researcher
Jones built much of Anthropic's early reinforcement-learning and sandboxing infrastructure and led its multimodal effort. He also contributed to automated red-teaming and Constitutional AI, which trains assistants using written principles and AI-generated feedback.
Anthropic2021-presentWork and education history is primarily focused on AI-relevant roles and may not be comprehensive.
Training AI assistants to be more helpful and less harmful using human feedback.
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Reviewed August 9, 2026 · Checked for accuracy and new information.