I'm a network security consultant, concentrating mostly on Cisco and Checkpoint, but with overlap into both UNIX and Windows platforms. I tend to work within my client's offices during the projects I'm working on, although I can have multiple clients at once so have to arrange my time between them.
I own my company, but that sounds grander than it really is as I'm also the sole employee. There was a time when I was ready to beef it up and take on staff, but after the dot-com bubble burst turnover took a dive for eighteen months and I shied away from the idea. It's much easier sleeping at night during bad times when you don't have the responsibility of others to pay.