Peter Larsson is a key player for performance written code. He can turn a 10 hour query into a 3 minute piece of code. Peter is also a SQL Server MVP since 2009.
He often hangs out at SQLTeam.com (27k+ posts) and other various sites where he helps all people understand SQL Server.
When not working, he takes care of a wife and 4 kids.
All developers and DBAs make mistakes when programming in SQL Server. Learn to avoid the most common mistakes.