Geoff Chappell is the author of the Windows programming resource at www.geoffchappell.com, of some articles for Poc||GTFO, and long ago of the book "DOS Internals". He has been reverse engineering since before many attendees were born. He developed it to be a better programmer but he occasionally moonlights as a security researcher. Some years he does well from being a bit of both. Others he can't get work as either. geoffchappell.com