Jonathan Bartlett is a computer programmer, technical writer, religious writer, publisher, and teacher (sometimes). His current book is Programming from the Ground Up ( http://www.cafeshops.com/bartlettpublish.8640017 ), which an older version is available in PDF format at http://savannah.nongnu.org/projects/pgubook/
Jonathan is currently working on a few projects to contribute to Chicken scheme and others, including:
Jonathan is also working on a practical programming languages book designed to show intermediate programmers useful ideas that are available in other languages, to help them look beyond their day job in their current language and see what the possibilities are.
Jonathan's home page is at http://www.eskimo.com/~johnnyb/