[daveungerer]

The sandal username on GitHub sounded familiar, so I checked and realised its the same sandal that does the Prawn PDF library: http://github.com/sandal/prawn

That gives the book some extra credibility in my eyes.

EDIT: OK, now that I've read the foreward, I see Matz himself mentions Gregory's work on Prawn. Doh.

[sandal]

Yes, I started Prawn via the "Ruby Mendicant" project: http://majesticseacreature.com/mendicant/

I'm still active in the project as a maintainer. But really, these days you have Brad Ediger, James Healy, and Daniel Nelson, along with about 60+ contributors to thank for where Prawn is heading.

My job is mostly to sit around naming things, and warning people about the fragility of the early code I wrote. But we will have a 1.0 plan soon, and no matter who does the work, that'll be good for everybody.