Mario Schlosser
About Mario Schlosser
Mario Schlosser is a co-founder of Oscar Health, a health insurer founded in 2012. He was its CEO from 2012 to 2023 and took the company from inception to more than one million members. He then served as President of Technology and Chief Technology Officer. Oscar's investor site now lists him as Co-Founder and Advisor to the CEO.
Before Oscar, he co-founded Vostu, which is described as Latin America's largest social gaming company. Crunchbase lists him as founder and Chief Scientist there from 2006 to 2012. He was a Senior Investment Associate at Bridgewater Associates and a consultant at McKinsey & Company in Europe, the U.S. and Brazil. Crunchbase says he was a visiting scholar at Stanford, where he co-authored 10 computer science publications.
He holds a computer science degree from the University of Hannover and an MBA from Harvard Business School. Duolingo's investor site says he has been a Duolingo director since July 2024. It also lists board seats at the Fraunhofer Institute for Applied Information Technology, Tech:NYC and the Guiding Council of One Mind At Work.
Crunchbase lists six personal investments for Mario Schlosser: Monogram, Audos, Ataraxis, Orchid, J2 Health and Medallion. The rounds shown are Seed for Monogram, Audos, Orchid and J2 Health, Series A for Ataraxis and Series B for Medallion. Crunchbase hides the investment dates in the public view, so we do not list years for these. His angel activity has not been described in detail in the sources we found.
The most recent AI round on the Lounge deals desk is Monogram's $40M seed (June 2026). Monogram is building visual, interactive interfaces for AI as an alternative to chat. Dealroom reports that DST Global and Lux Capital led the round, and that Eren Bali, who created Udemy and Carbon Health, founded the company.
Crunchbase also lists Ataraxis, Orchid and Audos among his investments, and a third-party investor directory tags him with AI, healthcare and enterprise technology. As Oscar's technology leader he has also overseen the company's work with large language models in member and operations workflows.
His public investments cluster around healthcare, health technology and AI, with one general-purpose AI interface company in Monogram. He has invested at Seed, Series A and Series B, according to Crunchbase. He is based in New York. We found no public statement from him on check size or on what he looks for in a pitch, so neither is given here.
- Monogram: builds visual, interactive AI interfaces beyond chat; $40M seed in 2026.
- Ataraxis: Series A investment listed on Crunchbase.
- Orchid: Seed investment listed on Crunchbase.
- Audos: Seed investment listed on Crunchbase.
- J2 Health: Seed investment listed on Crunchbase.
- Medallion: Series B investment listed on Crunchbase.
- crunchbase.com/person/mario-schlosser
- ir.hioscar.com/governance/board-of-directors/person-details/default.as
- investors.duolingo.com/board-member/mario-schlosser
- app.dealroom.co/news/feed/monogram-raises-40m-seed-to-build-visual-ai-
- x.com/mariots
- linkedin.com/in/mario-schlosser
- askforfunding.com/investor/mario-schlosser-angel-investor
- alejandrocremades.com/mario-schlosser
Investing activity
Mario Schlosser appears in 1 AI deal tracked by the Lounge deals desk, rounds totalling $40M. The rounds are mostly Seed, with a median round size of $40M. The most recent is Monogram (Seed, $40M, Jun 2026).
Mario Schlosser most often invests alongside Lux Capital, DST Global, Inc. and Conviction, and the companies they back on Lounge are mostly in AI.
Deals
Frequently asked questions about Mario Schlosser
Who is Mario Schlosser?
Mario Schlosser is a co-founder of Oscar Health and was its CEO from 2012 to 2023. He also co-founded the gaming company Vostu and sits on Duolingo's board.
Has Mario Schlosser invested in AI startups?
Yes. He is listed as an investor in Monogram's $40M seed round, and Crunchbase also shows Ataraxis, Orchid and Audos among his investments.
What is Mario Schlosser's angel check size?
We found no public information on his check size. We did not estimate one.
What stage does Mario Schlosser invest in?
Crunchbase lists his investments at Seed, Series A and Series B. Most are Seed rounds.
What sectors does Mario Schlosser back?
His listed investments are mainly in healthcare and health technology, plus AI. Monogram is an AI interface company.
How can founders reach Mario Schlosser?
He is on LinkedIn and posts on X as @mariots. Lounge cannot confirm that he takes cold pitches.
Is Mario Schlosser an angel investor?
Yes. Mario Schlosser invests personally as an angel.
What AI companies has Mario Schlosser invested in?
Mario Schlosser's AI investments include Monogram. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Mario Schlosser invest at?
In the rounds tracked on Lounge, Mario Schlosser has invested at Seed, with a median round of $40M.
Who does Mario Schlosser co-invest with?
Mario Schlosser's most frequent co-investors on Lounge are Lux Capital (1 deal), DST Global (1 deal), Inc. (1 deal), Conviction (1 deal) and Maxitech (1 deal).