David Wagonfeld is a co-founder of J-Ventures and simultaneously serves as Managing Partner at Castle Peak Partners (a multi-family office platform) and Partner at Tandem Capital, positioning him at the intersection of family office capital, early-stage venture, and community-driven VC. He has served as Treasurer and board leadership member of the Raoul Wallenberg Jewish Education Foundation since 2013, giving him a sustained governance role in education philanthropy that extends beyond typical venture investor involvement.
About their Fund
J-Ventures
Sectors
AI, Cybersecurity, Enterprise, Fintech, Health
Rounds
Avg Check Size
$250K - $1M
Notable Investments
J-Ventures operates as a "Capitalist Kibbutz" where its 400+ investors—including 140+ serial founders and 100+ VCs—actively help portfolio companies through a structured advisory platform rather than serving as passive capital providers. The fund explicitly positions itself as the largest Jewish investment fund globally, organizing tech investor missions to Israel and blending venture investing with Jewish community building and Zionist identity.
Other partners at the fund
Notable Fund
Investments
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Popular Investors
investor name
Active in
Rounds
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Links
Deeptech / Hardware
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Robotics
Biotech
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12
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Unknown
Pre-Seed - Seed
Unknown
$400K - $2M
Unknown
Defense
Deeptech / Hardware
Energy
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7
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Unknown
Pre-Seed - Series A
Unknown
$100K - $5M
Unknown
Defense
Deeptech / Hardware
Energy
+
7
View more in profile...
Unknown
Pre-Seed - Series A
Unknown
$100K - $5M
Unknown
Biotech
Health
Deeptech / Hardware
+
2
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Unknown
Pre-Seed - Seed
Unknown
$250K - $2M
Unknown
Climate
Deeptech / Hardware
Materials
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4
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Unknown
Pre-Seed - Seed
Unknown
$400K - $1.5M
Unknown
Deeptech / Hardware
Robotics
Biotech
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7
View more in profile...
Unknown
Pre-Seed - Seed
Unknown
$400K - $2M
Unknown
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Deeptech / Hardware
Robotics
Biotech
+
2
View more in profile...
Unknown
Pre-Seed - Seed
Unknown
~$750K
Unknown
Fintech
Deeptech / Hardware
Devtools
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2
View more in profile...
Unknown
Pre-Seed - Series A
Unknown
$250K-$1M
Unknown
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