Weinberg trained as a lawyer, attending the USC Gould School of Law, and worked as an associate at O'Melveny & Myers. He left the firm after one year to team up with AI researcher Gabriel Pereyra, and the two co-founded Harvey to build custom AI assistants for law firms. The company later expanded to private equity and accounting firms. Weinberg leads a small group of lawyers who feed their institutional knowledge into training the AI.
Harvey's early customers included Allen & Overy, where 3,500 lawyers and staff used it for document drafting and research, and PwC, where 4,000 legal professionals across 100 countries used it, according to Forbes, which also listed OpenAI and Sequoia among investors who had put $26 million into the startup. Weinberg's case against the model makers is that "the foundation models are competitors with every business on Earth," and that law firms want several models, which leaves room for an app layer.
Sources · written 16 October 2026
