All Around Great Guy
I work in industrial automation, starting out with control systems back in the 90's, and working up through MES and now visualization and analytical systems for a Fortune 500 company. I tend to focus on .NET (C# primary, VB.NET secondary) and T-SQL, but I dabble in python (including IronPython) and I am currently learning javascript. A LOT of my solutions deal with storing, retrieving, and visualization of time-series data.
One of my favorite eureka moments was when I realized that there is a point/wave duality to time-series data. Often, we deal with a value at a point in time. But if we have two consecutive points, then we have a time period, as the first value is valid, as far as we know, until the timestamp of the second value, so we have a start and end time for each value. This really opened up the door for me in terms of analytics.