secure-messaging
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David Craig
David Craig, MD is the CEO of Spruce Health, a San Francisco-based HIPAA-compliant healthcare communication platform serving 25,000+ healthcare providers. A Stanford-trained emergency medicine physician who began coding in his teens, Craig brings rare dual fluency in medicine and software engineering. He joined Spruce in 2014 as Chief Medical Officer before taking the CEO role in late 2021, and still works weekly ER shifts to keep his clinical perspective sharp while leading a team building the communication infrastructure for modern healthcare.
Trevor Perrin
Trevor Perrin is an applied cryptographer who co-created the Signal Protocol with Moxie Marlinspike - the encryption backbone now protecting conversations for over a billion people across Signal, WhatsApp, and beyond. He also designed the Noise Protocol Framework, a foundational cryptographic framework deployed in WireGuard, WhatsApp's client-server layer, and the Lightning Network. A 2017 Levchin Prize winner, Perrin works as an independent consultant on quantum readiness and cryptographic systems design.
Brian Acton
Brian Acton is the co-founder of WhatsApp, which sold to Facebook for $19 billion in 2014, and the founder of Signal Foundation, where he champions privacy-focused communication. After walking away from $850 million in unvested Facebook stock over ethical disagreements about user privacy, he invested $50 million to build Signal, an encrypted messaging platform designed to put users first. A Stanford computer science graduate who was rejected by both Facebook and Twitter in 2009, Acton has given over $1 billion to charitable causes with his wife Tegan, focusing on low-income families, reproductive rights, and internet privacy.