In 1993 she moved back to the United States to write books about using the internet and World Wide Web.

Currently based in Barcelona, she has also been active in the Catalan independence movement, promoting the cause in the English language sphere with her latest and most notable project being What's up with Catalonia?,[1] with authors like Josep Maria Ganyet, among many others.

Matthew Diener, editor of EPUBsecrets reviewed her fourth miniguide, praising how Castro takes the reader through the steps to make the "conversion to ePUB easier and better."

He lists ways that this miniguide aids users in placement and insertion of images and media, as well as preparing ePUBS to be used for Kindle editions.

"[3] Joel Friedlander in The Book Designer said, "Liz Castro has cracked the code on creating beautiful, functional ebooks...Liz Castro's EPUB Straight to the Point is a fantastic resource with clear instruction and should be in the ereader of anyone whose work involves dealing with EPUB and iBooks.