J Zac Stein is an angel investor and operator angel based in San Francisco, California, United States with 6 known investments: Parabola, Outset, Writer, Doorbell Health, Thena and VXT.
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Investment focus
- Stage
- Series B
- Sector
- ConsumerHealthcareSaaS
Contacts
J Zac Stein portfolio companies (6)
- Parabola
- Outset
- Writer
- Doorbell Health
- Thena
- VXT
Affiliated funds' portfolios
Venture Partner at Craft Ventures, whose known portfolio counts 12 companies
- Replit
- Candex
- Ditto
- Xona
- Upwind Security
- OpenEvidence
- Default
- Oasis Security
- WorkOS
- Comfy
- Fellow
- HYFIX Spatial Intelligence
Investor Profile
Founders in the listed sectors Consumer, Healthcare and SaaS, and focus areas Developer Tools, Digital Health, EHR and Enterprise SaaS will recognize the pattern in this portfolio.
Stage-wise, the known deals cluster around Series B rounds.
The portfolio and focus above give founders context on whether J Zac Stein matches their raise.
Colleagues at Craft Ventures
David O. Sacks
Founder/Partner
San Francisco, United States
Sky Dayton
Venture Partner
United States
Bryan Rosenblatt
Partner
New York, United States
Sean Whitney
Principal
San Francisco, United States
Kindle Van Linge
Principal
San Francisco, United States
Kevin Gabura
Principal
San Francisco, United States
Lainy Painter Singh
Partner
New York, United States
Zao Chen
Investor
United States
Sitara Ramesh
Investor
San Francisco, United States
Brian M.
Partner & COO
San Francisco, United States
Arra Malekzadeh
Investor
New York, United States
Jeff Fluhr
Venture Partner
San Francisco, United States
Georg Ell
Venture Partner
United Kingdom
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Frequently asked questions
Who is J Zac Stein?
J Zac Stein is an angel investor and operator angel based in San Francisco, California, United States with 6 known investments on file, among them Parabola, Outset and Writer. The sections above list the sectors, stages and firms attached to that record.
What does J Zac Stein invest in?
Listed sectors include Consumer, Healthcare and SaaS; listed focus areas include Developer Tools, Digital Health, EHR and Enterprise SaaS. Those tags come from the companies attached to this profile, so they read as a record of what has been backed rather than a stated preference for what comes next.
What stage does J Zac Stein invest at?
The known deals of J Zac Stein include Series B rounds. Stage is the strongest single filter when you build a target list: an investor with no record at your stage rarely starts with you.
Which firm is J Zac Stein listed at?
J Zac Stein is listed as Venture Partner at Craft Ventures. 13 other people in the database share a firm with J Zac Stein.
How do I contact J Zac Stein?
An email address and a LinkedIn page are on file for J Zac Stein. The address stays masked on this page and is readable inside RaiseHunt after you create an account. The database holds no phone number for this profile.
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Data: RaiseHunt investor dataset · Snapshot 5 September 2026 · How this data is built · Report a correction or request removal