Founders / Jonathan Rosenbluth
Jonathan Rosenbluth
Jonathan Rosenbluth is a co-founder of Blackletter, a legal AI company based in Toronto. Jonathan Rosenbluth co-founded Blackletter with David J. Stewart and Avi Brudner. Blackletter is listed in the portfolio of Ripple Ventures.
Jonathan Rosenbluth is co-founder and CEO of Blackletter, an AI-native law firm that handles financings, employment, corporate, commercial and M&A work for clients in the United States and Canada and does not bill by the hour. Rosenbluth was previously employee number 20 at Cohere, leading sales, partnerships and business operations before moving to product. Earlier, Rosenbluth worked at McKinsey & Company. Rosenbluth holds a JD from Harvard Law School and a history degree from Harvard University.
Co-founder of Blackletter.
Blackletter
AI-native law firm pairing automated legal work with lawyer judgement.
- Role
- Co-founder
- HQ
- Toronto, ON
- Status
- Active
- Website
- blackletterfirm.com
Co-founders: David J. Stewart, Avi Brudner
Investors: Ripple Ventures
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Data as of November 10, 2026.