---
title: "Jack Lindsey"
type: "entity"
entity_kind: "person"
status: "hub"
canonical_name: "Jack Lindsey"
aliases: []
first_seen: "2026-05-26T00:00:00.000Z"
writer_model: "claude-sonnet-5"
connects_to: ["On the Biology of a Large Language Model","attribution graphs","Anthropic interpretability team","Chris Olah"]
---


Lead author of Anthropic's *On the Biology of a Large Language Model* (2025), the single primary source underlying the largest interpretability claim-note cluster in this vault — refusal, hallucination, jailbreak, planning, and chain-of-thought-faithfulness mechanisms in Claude 3.5 Haiku, all traced via attribution graphs. First entered the vault by name in the source_author field of the earliest note drawing on that paper ([[cot-faithfulness-anthropic-biology]], 2026-05-26); promoted to a hub now that a critical mass of claim-notes trace back to his authorship.

## References
- [[claim-biology-llm-dallas-texas-austin-genuine-two-step-reasoning]] · [[claim-biology-llm-poetry-planning-preactivates-rhyme-words]] · [[claim-biology-llm-poetry-steering-swaps-rhyme-or-abandons-it]] · [[claim-biology-llm-hallucination-is-known-entity-suppression-misfire]] · [[claim-biology-llm-jailbreak-assembles-bomb-by-parallel-letter-votes]] · [[claim-biology-llm-refusal-chain-is-harmful-request-recognition]] · [[claim-biology-llm-jailbreak-sentence-boundary-delays-not-triggers-refusal]] · [[cot-faithfulness-anthropic-biology]]
- [[entity-on-the-biology-of-a-large-language-model]] · [[entity-attribution-graphs]] · [[entity-chris-olah]] · [[entity-claude-3-5-haiku]] · [[entity-feature-steering]]