Thomas L. Harrison
Senior Operating Partner @ Merida Capital Holdings
Armonk, United States
Thomas L. Harrison is a seed investor at Merida Capital Holdings in Armonk focused on Cannabis and SaaS. Thomas Harrison is Chairman Emeritus of Diversified Agency Services (DAS), the world's largest group of marketing services companies. A division of the Omnicom Group, DAS provides a broad range of marketing communications services including public relations, crisis management, branding, sales promotion, customer relationship management andspecialty communications such as health care advertising for some of the largest global brands. With over 5000 worldwide clients, the DAS division has annual revenues of almost $5.0 billion and is the largest unit within Omnicom, itself the world's largest advertising holding company.Harrison's multi-faceted career brought him to Omnicom in 1992 when the firm he co-founded, Harrison & Star Business Group, the most successful and rapidly growing agency in the healthcare industry at the time, was acquired. He was appointed President of DAS in 1997 and was named Chairman and Chief Executive of DAS in 1998.Harrison serves on a number of prestigious boards. He is a member of the Executive Committee of the Montefiore Hospital and is Fellow of the New York Academy of Medicine. Harrison is board member for ePocrates, a healthcare information company and The Morgans Hotel Group. He was President of a local Westchester County School Board and Chairman and Founder of the not-for-profit education foundation in that Westchester School District. He has been honored by Long Island College Hospital, The Children's Hospital at Montefiore, The Lymphoma Research Foundation, New York City's Health and Hospital Corporation, Mt. St. Vincent's College and others. He is a frequent speaker at business forums and at universities across the U.S. on the subject of entrepreneurialism, business strategies and the "Secrets to Success." He has spoken at West Virginia University where he did his graduate research in cell biology and physiology and where Harrison was recognized with the 2006 Distinguished Alumni Award and where Harrison received an Honorary Doctorate in 2007, the highest honor an American University grants to an individual.Thomas Harrison is the author of INSTINCT: Tapping Your Entrepreneurial DNA to Achieve Your Business Goals. Harrison has appeared on CNBC, CNNI, Bloomberg and Forbes.com discussing his book. He can be found on the Enterprise Leadership podcast as well as Forbes, Bloomberg, recently on American Management Association and other podcasts. Harrison lectures at Business Schools and Schools of Entrepreneurialism on topics discussed in INSTINCT.
- Total investments:
- 2
- Last investment:
- Lead investor:
- 100%
Last updated:
For AI agents: llms.txt
Industries Thomas L. Harrison invests in
Stages Thomas L. Harrison invests in
Countries Thomas L. Harrison invests in
Contacts
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Investment Focus
Industry
- Cannabis 2 (100%)
- SaaS 1 (50%)
- Gaming 1 (50%)
- E-Commerce 1 (50%)
- Advertising 1 (50%)
Stage
- Seed 1 (50%)
- Series C 1 (50%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| MainStem is a technology-based ancillary product distribution company in the regulated cannabis industry, is the leading comprehensive marketplace in the industry, with over 10,000 products for cannabis businesses to select. The company integrates its platform into popular industry software to maximize its customer reach and simplify theprocurement process. | $5M / Series C / Aug 30, 2021 | ||
| The MediaJel Platform powers compliant programmatic advertising across mainstream media and shows regulated brands exactly which ads, audiences, and channels drive customer acquisition, loyalty, and revenue. From Display, Native, CTV, and Digital Out of Home to SEO and SEM, we deliver full-funnel marketing and true revenue attribution.At the coreof the platform are four connected products that work together to give regulated brands an advantage no traditional agency or ad network can match:DemoGraph Audience Builder and audience intelligence for compliant 21+ targeting, behavioral insights, and lookalike modeling.DataJel Customer-level and revenue attribution that connects impressions to purchases, loyalty, and lifetime value.AuctionPlus Pricing Transparent bidding and pricing optimization that unlocks efficiency, premium inventory access, and spend transparency.Attention Signals Publisher analytics and editorial influence measurement that reveal how content engagement impacts ad performance and buying behavior.Together, these products form the MediaJel Platform: a unified system for regulated brands to reach customers, understand performance, and make decisions with confidence. | $2.5M / Seed / Jun 19, 2019 |
About Merida Capital Holdings
Merida Capital Partners is a private equity fund targeting fundamental growth drivers underpinning the rapid development of the cannabis industry. Our investment emphasis focuses on cultivation technologies, products and services associated with the evolution of cannabis as an agricultural product, a natural plant-based medicine, a constituent inpharmaceutical formulations, and a recreational consumer product.
Merida Capital Holdings Contacts
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Mitch Baruchowitz
Managing Partner
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Mitch Baruchowitz
Managing Partner
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Colin Kelley
Operating Partner
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Pamela Galassini
Senior Operating Partner
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Thomas L. Harrison
Senior Operating Partner
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FAQ
What does Thomas L. Harrison invest in?
Thomas L. Harrison invests primarily in Cannabis, SaaS and Gaming startups, most often at Seed and Series C stage. Most of the 2 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
How do I contact Thomas L. Harrison?
Public channels for Thomas L. Harrison include LinkedIn. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
When did Thomas L. Harrison last invest?
The most recent investment recorded for Thomas L. Harrison closed in Aug 2021. Shizune tracks 2 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Sep 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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