Roberto Ierusalimschy is the leading architect of the Lua programming language, driving its development since its inception in 1993. He is an Associate Professor of Computer Science at PUC-Rio (the Pontifical Catholic University of Rio de Janeiro), where he works with programming-language design and implementation. Roberto has a M.Sc. Degree and a D.Sc. Degree in Computer Science, both from PUC-Rio. He was a visiting researcher at the University of Waterloo, ICSI, GMD, and UIUC, and a Tinker Professor at Stanford. As a professor at PUC-Rio, Roberto was the advisor of several students that later became influential members of the Lua community. Roberto is also a Distinguished ACM Speaker and a member of the IFIP Working Group on Language Design.