Josh Meier
About Josh Meier
Joshua Meier is co-founder and CEO of Chai Discovery, an AI company based in San Francisco that works on molecular design. Chai was founded in 2024 with Jack Dent, Matthew McPartlon and Jacques Boitreaud.
According to Index Ventures, Meier graduated from Harvard with a double major in computer science and chemistry, then joined OpenAI in 2018. Chai's Series A announcement also lists earlier roles at the AI drug discovery company Absci and at Facebook AI.
Chai has announced a $70 million Series A in August 2025. Crunchbase-based reporting in August 2026 lists a $400 million round in July 2026 and $630 million in total equity funding. Backers named in that reporting include OpenAI, Menlo Ventures, General Catalyst, Index Ventures and Sequoia Capital.
The public record of Meier's angel investing is thin. The one investment confirmed in the sources reviewed is the Cheiron seed round announced in July 2026, where he is named among the strategic angel backers. Meier is not known to have published a full list of his angel investments, and no public portfolio page was found.
Cheiron announced an $8 million seed round on 22 July 2026, led by Menlo Ventures. Cheiron is building an AI-native operating system for drug development programs. The announcement names Chai Discovery co-founder and CEO Josh Meier among the strategic backers. Others named include Moderna co-founder Robert Langer, former Pfizer CMO Freda Lewis-Hall, former Starbucks CEO Laxman Narasimhan and former Apple AI chief John Giannandrea.
With one confirmed investment, the visible focus is early-stage AI applied to life sciences and biopharma, which matches his operating work at Chai. He appears in the Cheiron round as a strategic angel alongside a lead institutional fund. No public statements about check size, stage preferences or what he looks for in a pitch were found. Founders should not assume he invests outside biotech or AI.
- Cheiron: AI-native operating system for biopharma drug programs; participated in the $8M seed round announced in July 2026, led by Menlo Ventures.
- cheiron.bio/blog/company-fundraising-announcement
- finsmes.com/2026/07/cheiron-raises-8m-in-seed-funding.html
- hitconsultant.net/2026/07/22/cheiron-raises-8m-seed-menlo-ventures-dru
- crunchbase.com/person/joshua-meier-ac14
- indexventures.com/perspectives/transforming-biology-from-science-to-en
- businesswire.com/news/home/20250806670137/en/Chai-Discovery-Announces-
- alleywatch.com/2026/08/global-startup-funding-top-largest-july-2026-vc
Investing activity
Josh Meier appears in 1 AI deal tracked by the Lounge deals desk. The rounds are mostly Seed, with a median round size of $8M. The most recent is Cheiron (Seed, $8M, Jul 2026).
Josh Meier most often invests alongside Menlo Ventures, Robert Langer, Laxman Narasimhan and Freda Lewis-Hall, and the companies they back on Lounge are mostly in AI.
Deals
Frequently asked questions about Josh Meier
Who is Josh Meier?
Josh (Joshua) Meier is co-founder and CEO of Chai Discovery, an AI drug discovery company. He previously worked at Absci, Facebook AI and OpenAI.
Has Josh Meier invested in AI startups?
Yes. He is named as a strategic backer in Cheiron's $8M seed round, announced in July 2026 and led by Menlo Ventures. Cheiron builds AI software for drug development programs.
What check size does Josh Meier write?
His check size is not public. The Cheiron announcements give the round size but not individual amounts.
What stage and sectors does Josh Meier back?
The one confirmed investment is a seed-stage AI company in biopharma. There is no public statement of a wider thesis, so AI for life sciences is the safest assumption.
How can founders contact Josh Meier?
He is on LinkedIn and on X as @joshim5. No personal website or public pitch process was found.
Is this the same Josh Meier as the Andromeda Capital investor?
No. Andromeda Capital's Josh Meier invests in crypto and Web3. This profile covers the Chai Discovery CEO named in the Cheiron round.
Is Josh Meier an angel investor?
Yes. Josh Meier invests personally as an angel.
What AI companies has Josh Meier invested in?
Josh Meier's AI investments include Cheiron. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Josh Meier invest at?
In the rounds tracked on Lounge, Josh Meier has invested at Seed, with a median round of $8M.
Who does Josh Meier co-invest with?
Josh Meier's most frequent co-investors on Lounge are Menlo Ventures (1 deal), Robert Langer (1 deal), Laxman Narasimhan (1 deal), Freda Lewis-Hall (1 deal) and John Giannandrea (1 deal).