Do what exactly? I've designed sensitive accurate instrumentation systems (125 nV/bit) that typically made around $50M a year in sales. I designed analog electronic music synthesizers for top pro musicians when I was still in college. My cousin was a partner for Premier Labs that in the day made custom recording equipment for studios, many in NYC. When I was 19 (far too long ago) I helped him design mic preamps and line amps for his recorders. I worked at Bell Labs when it was still at top form for over 6 years. I think I've walked the walk. These days there isn't much engineering or manufacturing in the USA, very depressing. So now I earn my coin writing software for an evil financial entity on W Street. I really miss Bell Labs.