I just ran into a great summary of the History of DevOps by Damon Edwards.
Very nice explanation he published back in Sep 17, 2012 (Very glad it is still available)
It is cool he mentions Andrew Shaffer, and his 2008 presentation called “Agile Infrastructure” — His talk can be seen in YouTube here
With all of the talk today on Infrastructure as Code — it is interesting to see how far we have progressed…
Link to the YouTube follows: http://bit.ly/1NNplIc