Mark Kropf

Founder & CEO, Rensei | Enterprise OS for AI Agent Fleets | Former Google Cloud OCTO | Group CTO, Genius Sports | Former Global CTO, Pivotal

๐Ÿ“ United States๐Ÿ”„ Updated September 2026๐Ÿ’ผ 3 investments๐Ÿ“… 7 years investing๐Ÿ—“ Last invested Aug 2025
Operator-angel๐ŸŒ United States
3
Total investments
1
Early stage
0
Mid stage
0
Late stage
7y
Years active

Portfolio

3 investments ยท sorted by recency
All investments
Early stage
Mid stage
Late stage
Angel Investor
Aug 2025
Polyguard protects businesses from deepfake-powered attacks that exploit new vulnerabilities in hiring and help-desk workflows, through continuously verifying both authentic identity and true location. Founded in 2023 by Joshua McKenty (former NASA Chief Cloud Architect and OpenStack co-founder) and Khadem Badiyan (mathematician and pioneer in AI analysis of image semantics), and headquartered in New York, Polyguard is redefining anti-fraud technology for the AI era. Learn more at www.polyguard.ai.
Investor & Advisor
Jul 2019
Were building the place for authors and readers to gather in meaningful community around books. Has a book ever changed your life? If so, come change the world with us.
Angel Investor
Jan 2019
Supaku is a company based out of New York, NY, United States.
Experience ยท 4 entries
All (4)
Investments (3)
Founder (1)
2026
Founder & CEO
Mar 2026
Vendor-neutral orchestration and governance. Across any model, any tracker, any SDLC.
2025
Angel Investor
Aug 2025
Polyguard protects businesses from deepfake-powered attacks that exploit new vulnerabilities in hiring and help-desk workflows, through continuously verifying both authentic identity and true location. Founded in 2023 by Joshua McKenty (former NASA Chief Cloud Architect and OpenStack co-founder) and Khadem Badiyan (mathematician and pioneer in AI analysis of image semantics), and headquartered in New York, Polyguard is redefining anti-fraud technology for the AI era. Learn more at www.polyguard.ai.
2019
Investor & Advisor
Jul 2019
Were building the place for authors and readers to gather in meaningful community around books. Has a book ever changed your life? If so, come change the world with us.
Angel Investor
Jan 2019
Supaku is a company based out of New York, NY, United States.
Investment activity
2019โ€“2025 ยท 3 investments
2019220251
Recent (last 2 years)Earlier