Santiago Hernández
About Santiago Hernández
Santiago Hernández is a researcher at OpenAI on the Reasoning team. His personal site says he works on teaching models to code, do deep browsing and perform autonomous research. He is based between San Francisco and Mexico City.
He studied computer science at Stanford University, with an undergraduate degree and a master's, and graduated early. His site says he did research at Hazy Research on retrieval-augmented language models during his coterminal program. NFX Signal also lists him as a research assistant at the Stanford Artificial Intelligence Laboratory.
Before college he built two companies. One was an education platform for the Mexican education system, which his site compares to Khan Academy meets Netflix. The other was an automatic document extraction platform with large enterprise customers in Mexico.
His personal site describes him as an occasional angel investor. It does not list investments, dates or a number of deals, and no other public source found gives a full track record.
NFX Signal lists him as an Investment Partner at Dorm Room Fund, a student-run venture fund. That is a fund role, separate from his personal angel checks.
The one AI round confirmed on the Lounge deals desk is Aristotle's $5M seed, announced on September 16, 2026. Aristotle is a voice-first AI tutoring platform for students aged 13 to 18. True Ventures led the round, with Wicklow Capital and a group of angels also taking part. The press release names Hernández among the angels, as Research, OpenAI.
He has not published a thesis, preferred stage or personal check size. The only check figure found is on his NFX Signal profile, which lists $40K as the investment range and sweet spot for his Dorm Room Fund role. It should not be read as his personal angel check size.
The same NFX profile tags AI at Seed, Series A and Series B among its sectors, alongside education, health IT and retail. His one confirmed AI angel deal is a seed-stage education product. His background is in research on large language models and AI agents, and in education and document-processing startups.
- Aristotle: voice-first AI tutoring platform for students aged 13 to 18. He is named as an angel in its $5M seed round, announced September 2026 and led by True Ventures.
Investing activity
Santiago Hernández 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 Aristotle (Seed, $5M, Sep 2026).
Santiago Hernández most often invests alongside True Ventures, Ben Broca, Drew Wadsworth and Wicklow Capital, and the companies they back on Lounge are mostly in AI.
Deals
Frequently asked questions about Santiago Hernández
Who is Santiago Hernández the AI angel investor?
He is a researcher on OpenAI's Reasoning team and a Stanford computer science graduate. His personal site calls him an occasional angel investor.
Has Santiago Hernández invested in AI startups?
Yes. He is named as an angel in Aristotle's $5M seed round, announced in September 2026. Aristotle builds voice-first AI tutoring for students aged 13 to 18.
What is Santiago Hernández's angel check size?
He has not stated a personal check size. NFX Signal lists $40K for his Dorm Room Fund role, which is a fund figure and not his angel check size.
What stage does Santiago Hernández invest in?
The only confirmed AI deal is a seed round. He has not published a stage preference. His NFX Signal profile tags AI at Seed, Series A and Series B.
How can founders contact Santiago Hernández?
His personal site is tiagohernandez.com, and Lounge lists a LinkedIn profile for him. No public X account was found.
Is Santiago Hernández an angel investor?
Yes. Santiago Hernández invests personally as an angel.
What AI companies has Santiago Hernández invested in?
Santiago Hernández's AI investments include Aristotle. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Santiago Hernández invest at?
In the rounds tracked on Lounge, Santiago Hernández has invested at Seed, with a median round of $5M.
Who does Santiago Hernández co-invest with?
Santiago Hernández's most frequent co-investors on Lounge are True Ventures (1 deal), Ben Broca (1 deal), Drew Wadsworth (1 deal), Wicklow Capital (1 deal) and Cognition (1 deal).
How can founders reach Santiago Hernández?
Founders on Lounge can see Santiago Hernández'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 Santiago Hernández to their Investor Pipeline to track the conversation.