Karl Glazebrook FAA (born 1965) is a British astronomer, known for his work on galaxy formation, for playing a key role in developing the "nod and shuffle" technique for doing redshift surveys with large telescopes, and for originating the Perl Data Language (PDL).
Glazebrook also developed the open-source Perl Data Language, a perl-based alternative to the commercial IDL.
[3] The project, along with a number of other studies, determined in 2004 that massive galaxies formed surprisingly early in the distant Universe, explaining why a lot of them appear so remarkably old.
The bulk-averaged color earned some additional international publicity because a software bug had initially suggested a pale turquoise instead of the bland beige.
[5] He is also well known in the astronomical community for his pioneering work in developing the baryon oscillation technique to use the distribution of galaxies as a probe of dark energy.