Zachary Lipton
About Zachary Lipton
Zachary Lipton is Chief Technology Officer and Chief Scientist at Abridge, a healthcare AI company that builds ambient listening technology for clinical documentation. At Abridge he oversees the builder organization responsible for product development and AI research. He announced on X that he became Chief Scientific Officer after three years as a science advisor to the company.
He is also the Raj Reddy Associate Professor of Machine Learning at Carnegie Mellon University, where he directs the ACMI Lab. His research covers robust and adaptive machine learning, clinical medicine applications, natural language processing, and the societal impact of ML systems. His X bio also lists him as a creator of the d2l_ai project (Dive into Deep Learning).
Crunchbase lists past and current roles including Mad Scientist at Amazon AI and Contributing Editor at KDnuggets, and says he attended UC San Diego. CMU describes him as a former professional jazz saxophonist.
Public records of his angel activity are thin. Crunchbase lists one personal investment, a seed round in CloudCruise. The company's hiring post and the CloudCruise co-founder's announcement both name him among its angel investors, identified as CTO of Abridge. No other angel investments, check sizes or fund vehicles were found in public sources.
CloudCruise announced a $5M seed round in March 2026. The round was backed by Floating Point, Meridian Street Capital, Twine Ventures and Refract Ventures, plus angels including Lipton and David Singleton, formerly CTO of Stripe. CloudCruise builds computer-use infrastructure for healthcare: a coding agent that writes automation scripts, managed infrastructure to run them, and a maintenance agent that keeps them working as portals and EHRs change. Its workflows include eligibility checks, claims submissions and prior authorizations.
With one confirmed investment, a firm pattern cannot be established. The CloudCruise deal was a seed round in AI infrastructure for healthcare, which overlaps with his operating work at Abridge. He has not published a check size range, stage preference or thesis that we could find. He lists San Francisco as his location on X and LinkedIn.
- CloudCruise: browser and computer-use automation infrastructure for healthcare workflows; Lipton joined its $5M seed round, announced March 2026.
- crunchbase.com/person/zachary-chase-lipton
- linkedin.com/in/danny-hung
- ycombinator.com/companies/cloudcruise/jobs/5sB33KZ-chief-of-staff
- cloudcruise.com/blog/seed-round
- trysignalbase.com/news/funding/cloudcruise-raises-5m-seed-funding
- datascience.stanford.edu/people/zachary-lipton
- cmu.edu/news/experts/zachary.lipton
- abridge.com/author/zack-lipton
Investing activity
Zachary Lipton appears in 1 AI deal tracked by the Lounge deals desk. The rounds are mostly Seed, with a median round size of $5M. The most recent is CloudCruise (Seed, $5M, Mar 2026).
Zachary Lipton most often invests alongside David Singleton, Refract Ventures, Meridian Street Capital and Floating Point Ventures, and the companies they back on Lounge are mostly in AI.
Deals
Frequently asked questions about Zachary Lipton
Does Zachary Lipton invest in AI startups?
Yes. The one angel investment found is in CloudCruise, an AI automation infrastructure company for healthcare, in its $5M seed round announced March 2026.
What is Zachary Lipton's check size?
It is not public. No source we found states his check size, and CloudCruise did not disclose individual amounts.
What stage does Zachary Lipton invest in?
The only confirmed deal is a seed round. He has not publicly stated a stage preference.
Who is Zachary Lipton?
He is co-founder, CTO and Chief Scientific Officer of Abridge, and the Raj Reddy Associate Professor of Machine Learning at Carnegie Mellon University, where he directs the ACMI Lab.
What should founders know before pitching Zachary Lipton?
His public background is in machine learning research and healthcare AI. Pitches involving applied AI, especially in healthcare, are closest to his known work and his one confirmed investment, though he has not published a thesis.
Is Zachary Lipton an angel investor?
Yes. Zachary Lipton invests personally as an angel.
What AI companies has Zachary Lipton invested in?
Zachary Lipton's AI investments include CloudCruise. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Zachary Lipton invest at?
In the rounds tracked on Lounge, Zachary Lipton has invested at Seed, with a median round of $5M.
Who does Zachary Lipton co-invest with?
Zachary Lipton's most frequent co-investors on Lounge are David Singleton (1 deal), Refract Ventures (1 deal), Meridian Street Capital (1 deal), Floating Point Ventures (1 deal) and Twine Ventures (1 deal).
How can founders reach Zachary Lipton?
Founders on Lounge can see Zachary Lipton's contact details in AI Investor Contacts (paid plans), check for a warm introduction through members who worked with them under Warm Paths, and add Zachary Lipton to their Investor Pipeline to track the conversation.