Which DavidChappell?
There are two DavidChappells that are well known in the ICT ServiceOrientedArchitecture domain. And both have authored books.
This page serves to warn an unsuspecting WikiReader about the two different persons:
ESB DavidChappell
DonBox (XML version) with the two DavidChappell inside chappell_chappell.jpg, at http://www.oreillynet.com/images/weblog_graphics/chappell/