William Hess

Investment Stage

Focus Areas

About Investor

William Hess is a Principal at 645 Ventures focused on deep tech and fintech, with prior operating experience at FanDuel and investing experience at Thrive Capital. The firm focuses on seed and Series A technology across deep tech, fintech, enterprise software, consumer products, and infrastructure. The Principal role indicates the level at which this investor may participate in sourcing, diligence, investment decisions, portfolio support, or firm strategy. Founders should consider this investor when the company's stage, sector, business model, and technical or commercial needs align with the investor's direct experience and the firm's investment thesis. Their perspective can be useful around product-market fit, go-to-market planning, hiring, fundraising, strategic partnerships, and the milestones required for the next financing round. They may also help founders connect with portfolio executives, relevant operators, prospective customers, and follow-on investors within the firm's network. For founders comparing investors, the strongest fit is where the investor's domain knowledge, decision-making authority, and operating or investing background match the specific challenges the company expects to face after the round.