Roberto Ierusalimschy (; born 21 May 1960) is a Brazilian computer scientist, known for creating the Lua programming language. He holds a PhD in computer science from the Pontifical Catholic University of Rio de Janeiro where he has an appointment as a full professor of informatics. He did a post-doc at University of Waterloo in 1992 and was visiting professor at Stanford University in 2012. He is the leading architect and the author of Programming in Lua.Four editions: first ; second ; third ; and fourth . He also created LPeg, a Lua library for implementing parsing expression grammars.
In 2021, Roberto created Building a Programming Language, a project-based learning program where students learn how to build a programming language from scratch.
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