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.
Niels Berglund, Microsoft Valued Professional for OLE DB and ADO, teaches .NET and Microsoft data access for DevelopMentor. He has consulted widely on the development of distributed financial applications built with SQL Server.
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 has spoken and written widely on SQL Server.