Bob Beauchemin is a database-centric application practitioner and architect, DBA, instructor, course author, and writer. He's Director of Developer Skills at SQLskills (www.sqskills.com), and teaches his SQL Server 2005 courses around the world. Bob has written extensively on SQL Server and other databases, database security, ADO.NET, and OLE DB.
Dan Sullivan runs his own consulting company, does training for Pluralsight (www.pluralsight.com), and has worked with SQL Server since it was first distributed by Microsoft and ran on OS/2. Dan speaks and writes widely on SQL Server.