Justin Mateen co-founded Tinder and now runs JAM Fund, a $200M-$300M+ institutional fund where he backs founders with serious domain expertise who have something to prove, writing significant personal checks alongside fund capital to align his own balance sheet with theirs. He uses his consumer-founder credibility to support ambitious companies across frontier categories like nuclear energy, space manufacturing, and AI infrastructure, while also actively investing in emerging markets and maintaining an entrepreneurial footprint in high-profile real estate acquisitions. Justin Mateen co-founded Tinder and now runs JAM Fund, a $200M-$300M+ institutional fund where he backs founders with serious domain expertise who have something to prove, writing significant personal checks alongside fund capital to align his own balance sheet with theirs. He uses his consumer-founder credibility to support ambitious companies across frontier categories like nuclear energy, space manufacturing, and AI infrastructure, while also actively investing in emerging markets and maintaining an entrepreneurial footprint in high-profile real estate acquisitions.