Industrial engineer, working in emergency medical services in operations research to help optimize the service (i.e. figuring out where to let EMTs take their breaks in a metropolitan area to increase coverage of potential critical calls, short term demand prediction, employee scheduling and planning etc..). Been lurking on HN for a long time, and stumbled on it by chance and got hooked instantly. Like many others said, its a great way to stay on top of tech related issues/topics.