Can I Publish a Book Based on my Ph.D. Thesis and Other Practical findings after my P.h.D?

I have a followup question after getting the answer on the following question: Who Owns the Publishing Rights of my Ph.D. Thesis?.

After my Ph.D. I did work both in industry and in academic, and I think I have a reference book in me based on the theory side of my Ph.D. thesis and the practical knowledge I gained developed those theories (using main stream programming languages in my case); and the teaching experience on that matter.

So, is it possible to write a reference book based on theory contributions of my Ph.D. and practical findings based on those theories?