Brian Rosenzweig

Co-Founder & Partner, Joule Ventures
Brian, a bi-cultural U.S.-born operator-investor embedded in Israel’s innovation ecosystem, advises Israeli founding teams on product–market fit and North American go-to-market, having led market entry for 45+ portfolio companies.
How to contact Brian Rosenzweig
Stages their fund invests in
N/A
Sectors their fund invests in
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Avg Check
$1M - $3M
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Does their fund Lead?
Yes
N/A
Geos their fund invests in
USA, Israel
Brian Rosenzweig
Stages their fund invests in
N/A
Sectors their fund invests in
Enterprise
SaaS
Cybersecurity
AI
Fintech
N/A
Avg Check
$1M - $3M
N/A
Leads?
Yes
N/A
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Industries
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About Brian Rosenzweig

Brian is a bi-cultural operator-investor who was born and educated in the U.S. but spent most of his career embedded in Israel's innovation ecosystem, giving him hands-on experience helping Israeli founding teams with product-market fit and North American go-to-market strategies. Before co-founding Joule, he served as Director of Marketing at New York-based venture fund 21Ventures while living in Israel, where he designed and executed market entry strategies for 45+ portfolio companies—an unusual role where he functioned as a go-to-market strategist for an entire fund's portfolio rather than a single startup.

Brian Rosenzweig's Interests

What they've been talking about across their social media accounts
  • Insistence on founders doing their homework before making contact. Expects entrepreneurs to review the fund website to ensure their startup is a relevant fit, viewing a lack of basic preparation as inexcusable laziness.
  • Preference for responsible fundraising and realistic business growth over chasing hype. Warns that while massive funding rounds are widely celebrated, taking on too much capital introduces unnecessary risk, and expresses frustration with venture capitalists who push founders into valuation traps only to offer poor advice during market downturns.
  • Focus on the Israeli technology ecosystem and cross border scaling. Frequently highlights spending time with entrepreneurs in Tel Aviv and champions startups that are built locally but designed to scale within the United States market.
  • Commitment to actively promoting portfolio companies and their specific milestones. Regularly uses the platform to drive attention to product launches, webinars, and open job roles for backed startups like Outgage and AltostraHQ, directly attributing the success of the venture fund to the day in and day out hard work of these founders.

About their Fund

Joule Ventures

Sectors
Enterprise, SaaS, Cybersecurity, AI, Fintech
Rounds
Pre-Seed - Seed
Avg Check Size
$1M - $3M

Joule Ventures leads seed rounds in Israeli-founded enterprise technology businesses commercializing their solutions in the United States.

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Their due diligence process takes 1-3 weeks. 

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