# Yisi Gross

> Yisi Gross (Yisrael Gross) is an Israeli-rooted, New York-based technology entrepreneur and investor. He co-founded L7 Defense (now ammune.ai), an AI-driven API security company that raised Series A backing from TRUMPF Venture and Quick Heal, and today works as a Managing Partner at TYH Investments, backing early-stage high-tech startups. He built his reputation on the unglamorous frontier of API-borne attacks, arguing that autonomous, machine-learning defense - not human-tuned rules - is the only way to keep pace with modern cyberattacks.

- **Role:** Managing Partner at TYH Investments
- **Organizations:** TYH Investments, L7 Defense / ammune.ai, Your Start App, Dynasec, SDR-AI
- **Nationality:** Israeli
- **Education:** MBA, Finance and Marketing, The Hebrew University of Jerusalem
- **Known for:** Co-founded L7 Defense / ammune.ai, a pioneer in AI-led API security, Helped raise a $4M Series A from TRUMPF Venture and Quick Heal Technologies, Drove partnerships including Niagara Networks (Zero Trust for API communication) and NVIDIA BlueField-2 integration

## Career timeline

- **before 2015** — CEO of Your Start App
- **2015** — Co-founded L7 Defense (later ammune.ai) with Dr. Doron Chema
- **2021** — L7 Defense closed a $4M Series A led by TRUMPF Venture with Quick Heal Technologies
- **2022** — ammune integrated with NVIDIA BlueField-2 DPUs
- **2024** — Speaker at Restart IL Economy conference, New York, as Managing Partner of TYH Investments
- **present** — Managing Partner at TYH Investments, investing in early-stage high-tech startups

## Achievements

- Co-founded L7 Defense / ammune.ai, a pioneer in AI-led API security
- Helped raise a $4M Series A from TRUMPF Venture and Quick Heal Technologies
- Drove partnerships including Niagara Networks (Zero Trust for API communication) and NVIDIA BlueField-2 integration
- Ammune platform recognized by Frost & Sullivan and deployed across finance, telecom and SaaS in North America, Europe and Asia-Pacific
- Now a Managing Partner at TYH Investments backing emerging high-tech companies

## Latest updates

- **2024-01** — Spoke at the Restart IL Economy conference in New York as Managing Partner of TYH Investments.
- **2024-01** — Active as Managing Partner at TYH Investments, investing in early-stage high-tech startups alongside Meir Izralevich.

## Links

- Website: https://ammune.ai
- LinkedIn: https://www.linkedin.com/in/yisraelgross/
- Twitter/X: https://twitter.com/l7defense
- Facebook: https://facebook.com/l7defense

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Profile page: https://yespress.io/yisi-gross
Published by YesPress — https://yespress.io
Last updated: 2026-07-07