Darren Jefford (Wiltshire, UK) joined Microsoft UK in 2002, and has worked with BizTalk Server 2004 with various customers in the UK since 2003.  He has been involved with the architecture design, development, testing and deployment of a number of large scale BizTalk Servers. He has a popular blog (http://blogs.msdn.com/darrenj/) that has allowed him to become one of the best known worldwide experts in this space.