I'm a consultant/trainer/author, SQL MVP, Microsoft Regional Director, and Contributing Editor of TechNet Magazine and SQL Server Magazine. And I also blog and twitter a ton (twitter.com/PaulRandal), and I'm married to Kimberly Tripp. Phew!
I was on the SQL team for almost 9 nine years - wrote a bunch of DBCC commands (e.g. INDEXDEFRAG, SHOWCONTIG, CHECKDB/repair), and ended up being responsible for the entire Core Storage Engine for SQL 2008.
I'm an expert on internals, HA, maintenance, and disaster recovery. I teach this stuff internally for Microsoft and at conferences/clients around the world.
The answer is usually 'it depends'! :-) Follow me on twitter: @paulrandal