I'm a mechanical engineer for Siemens Industry. We design and install HVAC control systems for large office buildings, hospitals, schools, museums, ect. I spent 5 years in the field installing and starting up the systems. Now I sit in a cubicle and design them and organize the labor. I'm about 2 steps away from demoting my self back to the field though. I don't think I'm made to sit in a cubicle every day.