Ray Rankins and Paul Bertucci own consulting companies (Gotham Consulting Services and Database Architechs) that go into companies and implement or troubleshoot individual systems and train others regularly. Each of them has been working with SQL Server for over 7 years. Rankins has been involved with the success of the SQL Server Unleashed editions from the very beginning.
Chris Gallelli (Albany, NY), president of CGAL Consulting Services, specializes in database administration, tuning, and programming.
Alex T. Silverstein (Saratoga Springs, NY) is managing principal and chief architect of the Unified Digital Group, LLC, a developer of custom SQL Server and Microsoft .NET solutions.