Brian Kernighan is a Canadian computer scientist, widely known through co-authorship of the first book on the C Programming Language with Dennis Ritchie. Every computer science student has a copy of it! However he affirmed that he had no part in the design of the C language ("it's entirely Dennis Ritchie's work", he said.)
Kernighan worked at Bell Labs alongside Unix creators Ken Thompson and Dennis Ritchie, and coined the term "Unix". His original 1978 implementation of "Hello, World" was sold at The Algorithm Auction, the world's first auction of computer algorithms.
A Professor of Computer Science at Princeton, Brian Kernighan is also a coauthor of AWK and AMPL programming languages (the "K" in AWK stands for "Kernighan",) and author of many Unix programs including "ditroff" and "cron" for Unix 7.
The first "Hello World" appeared in 1972 in "Tutorial Introduction to the Language B" by Brian Kernighan, who also cowrote the definitive book on the C Programming Language, which contained the famous code example. Unfortunately, Kernighan doesn't remember exactly why he used those words in the first place: "Memory is dim now. What I do remember is that I had seen a cartoon that showed an egg and a chick and the chick was saying: 'Hello, World'."