Chris Saxon, Oracle Developer Advocate for SQL
   
Chris Saxon is the quizmaster for the Database Design competitions and an Oracle Developer Advocate for SQL. His job is to help you get the best out of the Oracle Database and have fun with SQL! He's also part of the answer team on Ask TOM and creates YouTube videos at The Magic of SQL channel.
Stew Ashton,
   
Stew is one of the top SQL developers in the Oracle community, to which he has contributed for several years through the AskTom site, the OTN/ODC forum dedicated to SQL and PL/SQL, and his blog. He is also an award-winning conference speaker.
Stew has been a developer and application architect for 35 years, working in mainframe, client-server and web architectures. Since 2005 he has focused on proper use of the Oracle database in OLTP applications and batch processing, often improving performance up to 300-fold.