Many organizations stopped upgrading Perl after the release of 5.8.8 or 5.10.1, about 8 to 11 years ago. At that point in history, major releases of Perl could take many years to come to fruition. To make things more confusing, point releases of a given version sometimes contained large changes (including backwards incompatibilities) that we'd expect in major releases. For example, 5.10.1, released 20 months after 5.10, contained a number of backwards incompatibilities and quite a few new features.
Dave Rolsky has been a Perl developer since 1999, and has created or contributed to dozens of CPAN modules, including DateTime, Log::Dispatch, Params::Validate, and more. He is also a member of the Moose core development team, and in early 2009 completed a TPF grant to substantially rewrite and expand the Moose documentation. Way back when, he co-wrote Embedding Perl in HTML with Mason and RT Essentials, both published by O'Reilly. He spends a lot of his free time on animal advocacy, and otherwise vegetates with video games, books, and TV shows, like any proper nerd.