Sebastien de Halleux is a serial entrepreneur-operator who co-founded Playfish (one of the earliest social gaming studios), Saildrone (autonomous ocean data drones), and Field AI (field autonomy for robots), giving him hands-on experience building products across consumer gaming, ocean tech, and AI robotics rather than coming from a traditional finance background. He maintains a distinctive philosophy that there is no such thing as a low-quality user, only a low-quality experience, focusing on product quality and user delight over short-term monetization tactics.
What they've been talking about across their social media accounts

- Passion for the intersection of mobile gaming and professional sports. He is actively building and promoting a football-based gaming platform, frequently highlighting partnerships with global stars like Lionel Messi and Alexia Putellas to engage fans during major events like the World Cup.
- Dedication to ocean technology and climate data collection. He often reflects on his operational experience with autonomous marine vehicles, citing specific missions where drones were used to map ocean currents or measure carbon absorption to help scientists better understand planetary systems.
- Interest in deep tech and frontier engineering. He celebrates tangible advancements in hardware and transportation, such as the development of electric seagliders by Regent Craft or the engineering feats involved in NASA space exploration missions.
- Belief in capital as a tool for environmental impact. He discusses the responsibility of investors to support climate solutions, noting that while venture capital is transformative, solving global warming requires collaboration that extends beyond just financial backers.
About their Fund
Sectors
Fintech, Ecommerce, Marketplaces, Enterprise, SaaS, Education, Deeptech / Hardware, Media, AI, Devtools, Proptech, Web3 / Crypto
Rounds
Seed - Series A
Avg Check Size
$50K - $300K
Notable Investments
Graph Ventures is an early-stage fund run by active founders and operators who are still building companies, rather than ex-operators who switched to VC full-time. Since 2011, they've invested in 300+ teams with nine unicorns and multiple IPOs/M&A exits, while maintaining 70% diversity in their latest fund and investing over a third of their portfolio outside the U.S.
Other partners at the fund
Notable Fund
Investments
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Popular Investors
investor name
Active in
Rounds
Avg. Check
Links
Deeptech / Hardware
Robotics
Biotech
+
12
View more in profile...
Unknown
Pre-Seed - Seed
Unknown
$400K - $2M
Unknown
Defense
Deeptech / Hardware
Energy
+
7
View more in profile...
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
View more in profile...
Unknown
Pre-Seed - Seed
Unknown
$250K - $2M
Unknown
Climate
Deeptech / Hardware
Materials
+
4
View more in profile...
Unknown
Pre-Seed - Seed
Unknown
$400K - $1.5M
Unknown
Deeptech / Hardware
Robotics
Biotech
+
7
View more in profile...
Unknown
Pre-Seed - Seed
Unknown
$400K - $2M
Unknown
Deeptech / Hardware
Robotics
Biotech
+
2
View more in profile...
Unknown
Pre-Seed - Seed
Unknown
~$750K
Unknown
Fintech
Deeptech / Hardware
Devtools
+
2
View more in profile...
Unknown
Pre-Seed - Series A
Unknown
$250K-$1M
Unknown
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