So....Who wrote this book?

They all did

Considering Tom Clancy is dead, it was probably Mike Maden.

For the record, the Tom Clancy moniker just means that it is set in the Tom Clancy universe, which, if I'm not mistaken, is just as detailed as the Star Wars Expanded Universe and the Warhammer 40k universe.
I refuse to call the EU "Star Wars Legends".

Boy, the Tom Clancy universe is my favorite universe, Rainbow Six, Ghost Recon and Splinter Cell, 3 series of games that are shiny gold