Caleb Madsen

Founder, Mad House Consulting | Fractional Marketing for DTC Brands | Growth, Retention & Performance Marketing | $400M+ Revenue Led

📍 United States🔄 Updated September 2026💼 1 investments📅 1 years investing🗓 Last invested Apr 2025
Operator-angel🌍 United States
1
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Mid stage
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Late stage
1y
Years active

Portfolio

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Investor
Apr 2025
OpenAI is an AI research and deployment company dedicated to ensuring that general-purpose artificial intelligence benefits all of humanity. AI is an extremely powerful tool that must be created with safety and human needs at its core. OpenAI is dedicated to putting that alignment of interests first — ahead of profit. To achieve our mission, we must encompass and value the many different perspectives, voices, and experiences that form the full spectrum of humanity. Our investment in diversity, equity, and inclusion is ongoing, executed through a wide range of initiatives, and championed and supported by leadership. At OpenAI, we believe artificial intelligence has the potential to help people solve immense global challenges, and we want the upside of AI to be widely shared. Join us in shaping the future of technology.
Experience · 3 entries
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Investments (1)
Founder (1)
2025
(un)limited partner
Apr 2025
At PariPassu, we’re building the world’s most powerful network of founder support—where capital is supercharged by community. One deal at a time, we’re building a faster, more flexible way for founders, operators, and accredited tech enthusiasts to co-invest in industry-defining startups—alongside many of the world’s top venture firms. Those who invest with us are more than just backers—they’re (un)limited partners. (un)limited partner [noun]: Someone who moves with conviction, thinks independently, and backs bold ideas. (un)limited partners aren’t bound by fund cycles, red tape, or traditional investing hierarchies. They operate on their own terms—deal-by-deal. It’s more than a title. It’s a mindset. A belief that great investing can be faster, freer, and built on community—not committees. Our previous investments include SpaceX, Function Health, CHAOS Industries, Sydecar, Siena, and many more.
Investor
Apr 2025
OpenAI is an AI research and deployment company dedicated to ensuring that general-purpose artificial intelligence benefits all of humanity. AI is an extremely powerful tool that must be created with safety and human needs at its core. OpenAI is dedicated to putting that alignment of interests first — ahead of profit. To achieve our mission, we must encompass and value the many different perspectives, voices, and experiences that form the full spectrum of humanity. Our investment in diversity, equity, and inclusion is ongoing, executed through a wide range of initiatives, and championed and supported by leadership. At OpenAI, we believe artificial intelligence has the potential to help people solve immense global challenges, and we want the upside of AI to be widely shared. Join us in shaping the future of technology.
Founder & Fractional CMO
Mar 2025
Marketing, Analytics, and Data Solutions by Mad House What is Mad House? Caleb Madsen is a growth marketing expert with senior leadership experience at top companies like THG (Dermstore), Skeepers (SaaS), and Win Brands Group. He’s now offering his services to brands that need senior-level marketing expertise but aren’t quite ready for a full-time hire or have been burned by marketing hires in the past. Caleb is a family man at heart, with a madhouse of his own at home. This, combined with his whirlwind career, means he is no stranger to stepping into chaos and cultivating clarity. Mad House is your path to scalable success, sustainable growth, and peace of mind.