Alexander Ratner
Angel Investor
Stanford, United States
Alexander Ratner is a seed investor in Stanford focused on Artificial Intelligence and Database. Alex Ratner is a third-year PhD student at the Stanford InfoLab working under Chris Re. Alex works on new machine learning paradigms for settings where limited or no hand-labeled training data is available, motivated in particular by information extraction problems in domains like genomics, clinical diagnostics, and political science. He coleadsthe development of the Snorkel framework for lightweight information extraction.
- Total investments:
- 2
- Last investment:
- Lead investor:
- 0%
Last updated:
For AI agents: llms.txt
Industries Alexander Ratner invests in
Stages Alexander Ratner invests in
Countries Alexander Ratner invests in
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Investment Focus
Industry
- Artificial Intelligence 2 (100%)
- Database 1 (50%)
- Open Source 1 (50%)
- Generative AI 1 (50%)
- Search Engine 1 (50%)
Stage
- Seed 1 (50%)
- Series A 1 (50%)
Country
- Germany 1 (50%)
- United States 1 (50%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Infinity AI is a technology startup that builds AI models faster with synthetic data. The startup's parameterized generators provide complete control over synthetic data distributions such as body shape, skin tone, lighting conditions, camera angles, and other factors. Its engineers can upload a single real-world video and turn it intohundreds of identical and perfectly labeled synthetic videos using the platform. Infinity uses a combination of physics-based simulations and generative techniques to do this.The company is based in San Francisco, California. | $5M / Seed / Dec 15, 2022 | ||
| deepset builds the technology enterprises rely on to create custom, production-ready AI applications. We are the company behind Haystack, the leading open-source AI orchestration framework, and the deepset AI Platform for building mission-critical AI agents and applications. Since 2018, we’ve helped organizations such as Siemens, Airbus, TheEconomist, and the German Armed Forces bring the latest in large language models and NLP into real-world use, delivering proven open-source technology and enterprise-grade solutions adopted by thousands of AI teams worldwide. | $14M / Series A / Apr 28, 2022 |
Co-Investors
Access 48,091 investors
822 industries, 177 countries. Updated daily. Emails and phones included.
Browse database — It's Free!
Find investors for your startup
Search 48,091 investors by industry and country. Emails and phones included.
Similar Investors
Recommended lists
FAQ
What does Alexander Ratner invest in?
Alexander Ratner invests primarily in Artificial Intelligence, Database and Open Source startups, most often at Seed and Series A stage. Most of the 2 investments tracked by Shizune back companies in Germany. The Investment Focus section breaks down every industry, stage and country in the portfolio.
How do I contact Alexander Ratner?
Public channels for Alexander Ratner include LinkedIn. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
When did Alexander Ratner last invest?
The most recent investment recorded for Alexander Ratner closed in Dec 2022. Shizune tracks 2 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Oct 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
Contact your first 100 investors today
Find who invests in your industry, stage, and country. Download investor list with emails in 5 minutes.
Find investors — It's Free!
Continue with Google
Continue with LinkedIn
