I'm currently employed by Booz Allen Hamilton.
I spent a long time working for Lockheed Martin early in my career, programming DEC PDP-11, VAX, and Alpha computer systems and workstations.
I'm experienced with operating systems, low level embedded programming, software reverse engineering,...
I've been a Mac user since shortly after the first Mac was introduced. My first Mac was a Mac II with whatever the Apple-supported maximum memory was (8 megabytes?). These days I have a large Mac Pro sitting under my desk at home.
I enjoy retro-computing, have an old OpenVMS Alpha system in my home office, and occasionally fire up a simh-based virtual VAX/VMS system.