Senior Programmer Doug Tidwell is IBM's evangelist for Web Services. He was a speaker at the first XML conference in 1997, and has been working with markup languages for more than a decade. He holds a Bachelors Degree in English from the University of Georgia and a Masters Degree in Computer Science from Vanderbilt University. He can be reached at dtidwell@us.ibm.com. You can also see his Web page at ibm.com/developerWorks/speakers/dtidwell/.