
Han R. Diaz
Co founder and Chief Legal Officer · Legal and AI engineering
The foundation was built inside litigation law firms. Over more than a decade in legal operations, Han worked across litigation firms, freelance paralegal engagements spanning bankruptcy, litigation and corporate matters, and corporate in house legal operations at Nike, supporting vendor due diligence, sponsorship and collaboration contracts, M&A, and real estate work for major headquarters projects.
That operating experience exposed the same recurring failure points across legal teams: fragmented workflows, undocumented processes, repetitive administrative work, and technology that often stops at the point where execution actually begins.
At Meta, Han worked on Llama legal reasoning, bringing legal domain experience into AI development. ProofGuard grew from that combination: legal operations knowledge, AI engineering fluency, and a first principles understanding of where automation can improve legal work without displacing attorney judgment.

Jessica Shin
Co founder and Chief Operating Officer · Go to market and operations
Jessica brings more than six years of business development experience across semiconductor and AI markets, with a focus on turning technical products into commercially viable businesses. Her work spans partnership development, product positioning, early stage product strategy, market entry, and the operating systems required to move a company from concept into repeatable execution.
Before ProofGuard, Jessica founded a South Korea based plastic surgery software company, raised capital, and led the business through an acquisition by a hospital group in South Korea. That gives ProofGuard leadership experience not only in building technology, but in financing it, positioning it, selling it and navigating an exit.
At ProofGuard, Jessica leads go to market strategy, business development, partnerships, product strategy and company operations, translating the technical and legal capabilities of the platform into solutions firms can adopt, measure and scale.