Gili Raanan (born 1969) is an Israeli inventor who is one of the inventors of CAPTCHA (US patent application with 1997 priority date ), the WAF (web application firewall) and many other inventions in the fields of application security and discovery. Raanan started Sanctum in 1997, and invented the first Web application firewall AppShield and the first Web application penetration testing software AppScan. He later started NLayers which was acquired by EMC Corporation pioneering the science of Application discovery and understanding. He is an investor and a General Partner at Sequoia Capital, the Founder of Cyberstarts, and was a board member at Adallom, , Onavo, Moovit and Snaptu.