Roberto Ierusalimschy (Brazilian Portuguese: [ʁoˈbɛʁtu jeɾuzaˈlĩski]; 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.

[2] He is the leading architect and the author of Programming in Lua.

[3] He also created LPeg, a Lua library for implementing parsing expression grammars.

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