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Joseph "Yossi" Haimberg, Managing Partner

Yossi is a seasoned international business executive and co-founder of Catalyst. Prior to his brokerage career, Yossi owned a gluten-free commercial bakery, served as President & CEO of a leading medical imaging corporation with 20 locations across the US East Coast, and served as Managing Partner of a medical imaging company in Israel that was first to own and operate free-standing private MRI, Ultrasounds, and CAT Scanners technologies in the country.


He received his MBA degree from the University of Cape Town and a B.Sc. in Computer Science from the University of South Africa. Currently, Yossi is a Ph.D. student at Portland State University. He is also a Licensed Real Estate Broker in Florida and a Principal Real Estate Broker in Oregon.

Nadav Haimberg, Managing Partner

Nadav is co-founder of Catalyst and is responsible for deal flow origination and sell-side representation. He founded and operated high tech, automotive, and consumer product companies and is currently CEO of FIVE Organic, an organic enhanced water line sold nationwide in grocery chains such as Publix, Costco, Walmart and Kroger stores.


Most recently he exited Onli Beverages, a manufacturer of a sparkling water line that was sold in Publix, Whole Foods, Kroger, Target, and HEB. Nadav also worked at Merill Lynch and served as CTO at Colonial Healthcare. He holds his MBA from Rollins College and BSc (computer science) from the University of Central Florida..

Tami Dreifuss, CFO

Tami has over 30 years of finance and accounting experience. She served as CFO at Onli Beverages and is currently CFO of Five Organic, both consumer product companies. Prior to that, she served as CFO of a medical imaging chain and an assisted living facility.


She holds a B.A. in Social Work from The Hebrew University in Jerusalem and has extensive experience in manufacturing accounting and bookkeeping.

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