# Jack Gierlich

> Jack Gierlich is a Brooklyn-based growth marketing founder and fractional CMO who has spent 15+ years scaling healthcare, SaaS, and AI companies. He leads marketing and growth at Leal Health (formerly TrialJectory), an AI-powered platform that helps cancer patients find advanced treatment options, and he moderates several of the largest marketing and business communities on Reddit, reaching millions of readers a month. He describes his craft as building marketing systems that compound rather than one-off campaigns.

- **Role:** Head of Marketing & Growth / Fractional CMO at Leal Health
- **Organizations:** Leal Health, TrialJectory, Glimpse, Actually Health, GrowthMentor, Index & Thread
- **Nationality:** American
- **Education:** Economics, Baruch College, City University of New York (CUNY)
- **Known for:** Supported 400+ startups across healthcare, SaaS, and AI, Helped generate $300M+ in revenue for clients and companies, Mentored 140+ founders

## Career timeline

- **2016-2018** — Studied Economics at Baruch College (CUNY)
- **2020s** — Director of Media Strategy, then Head of Marketing & Growth at TrialJectory
- **2023** — TrialJectory rebrands as Leal Health; Gierlich leads marketing and growth
- **Ongoing** — Board Advisor at Glimpse and Founding Advisor at Actually Health
- **Ongoing** — Moderates major marketing, sales, and business subreddits reaching millions monthly
- **2025** — Leal Health acquired by Nexus Precision Health

## Achievements

- Supported 400+ startups across healthcare, SaaS, and AI
- Helped generate $300M+ in revenue for clients and companies
- Mentored 140+ founders
- Shipped 12 growth tools
- Moderates Reddit communities reaching 25M+ annual visitors
- Led growth for Leal Health / TrialJectory's cancer-treatment matching platform

## Latest updates

- **2025** — Leal Health, where Gierlich leads marketing and growth, was acquired by Nexus Precision Health.
- **2025** — Continues offering fractional CMO leadership and growth advisory for healthcare, SaaS, and AI companies.

## Links

- Website: https://jackgierlich.com/
- LinkedIn: https://www.linkedin.com/in/jackgierlich/
- GitHub: https://github.com/Gr0wthHacker

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Profile page: https://yespress.io/jack-gierlich
Published by YesPress — https://yespress.io
Last updated: 2026-07-16