Yes, O'Reilly is a publisher, and it has published a UF compilation named "Evil Geniuses in a Nutshell".

However, a publishing company can still be the "author" of a text under the "work for hire" or "work of corporate authorship" rule. I'll give US law; EU and Canadian laws should be somewhat similar:

A ''work made for hire'' is - (1) a work prepared by an employee within the scope of his or her employment; or (2) a work specially ordered or commissioned for use as a contribution to a collective work, as a part of a motion picture or other audiovisual work, as a translation, as a supplementary work, as a compilation, as an instructional text, as a test, as answer material for a test, or as an atlas, if the parties expressly agree in a written instrument signed by them that the work shall be considered a work made for hire.
(17 USC §101)

The publisher generally owns the copyright on a work for hire.