John B. Quinn

John B. Quinn is the founder of Quinn Emanuel Urquhart & Sullivan, LLP, one of the largest litigation-focused law firms in the world. He is listed first on the signature block of the complaint that Reddit, Inc. filed against the artificial-intelligence company Anthropic, PBC, in San Francisco Superior Court in 2025. The complaint alleges that Anthropic scraped Reddit content to help train its Claude AI models without authorisation, asserting California causes of action including breach of contract, unjust enrichment, trespass to chattels, tortious interference, and unfair competition. Quinn appears alongside firm colleagues representing Reddit in the matter. The case is among the first in a wave of litigation in which Reddit has sought to assert control over the use of its users' posts as training data for generative-AI systems, and Quinn is the named senior lawyer leading Reddit's side of that suit.