Colan, Mark - XML evangelist for IBM. Find his presentation material here. He gives technical, keynote, and customer presentations on Web Services and XML technologies and strategy, and has spoken at most XML conferences in 2000 and 2001.. - http://www-128.ibm.com/developerworks/speakers/colan/
Dumbill, Edd - Managing Editor of XML.com, publisher of XMLhack.com - http://www.oreillynet.com/pub/au/96
Tobin, Richard - Author of RXP parser, co-author of XSV schema validator. Co-editor of XML Infoset specification. - http://www.cogsci.ed.ac.uk/~richard/
Maloney, Murray - A member of the XML WG, a co-editor of the W3C XML schema Language, involved in developing WWW specs since 1993. Frequent speaker and noted expert on XML and electronic commerce. - http://www.muzmo.com
Clark, James - Author of XSLT Working Draft, expat SGML/XML C++ parser, and XP/XT Java classes for XML/XSL parsing - http://www.jclark.com/
Bray, Tim - Co-author of the XML 1.0 recommendation, now with Textuality, writes/edits for the xml.com magazine. - http://www.textuality.com/textuality.html
Tauber, James - Author and frequent speaker on XML. - http://www.jtauber.com/