tgayley
I started working at Wolfram Research in 1992, in the tech support department, eventually working at some point in almost all the major departments in the company at the time: Applications, Kernel, and Front End. Interestingly, I originally came to the company’s attention by demonstrating expertise in an online forum not totally unlike this one–the Mathematica CompuServe forum (how many readers can say they were around for that?)
I left Wolfram Research in 1997, planning to combine my biology PhD and my newly-honed programming expertise, but after three years programming at a biotechnology company I could not resist the pull of the Mathematica universe and returned to Wolfram. I brought with me a little product I had written in the interim called J/Link. Since then I have become something of an expert in Mathematica connectivity, writing .NET/Link, the paclet system, the Wolfram|Alpha API, the first version of the Wolfram|Alpha Android app, and contributing to many areas of the Mathematica system.