You could work for any manufacturer, past or present...

This is easy . I had occasion to meet many but one guy sticks out . Stu Hegeman was a wild guy who drank a bit but had more original
thoughts that anyone I ever met .
I meet him at the big Chicago show in ’70 , ended up eating lunch with him and he actually built one of his Hapi preamps for me himself .I kept it alive for 40 years !

Past:  Henry Kloss :)

Present:  Ralph Karsten, Dan D'Agostino, Nelson Pass

Sony. The Esprit line, big tube condenser mics, reel to reels and all sorts of digital — variety being the spice of life.

A friend just informed me he worked for NY audio Lab - Julius Futterman’s outfit.

*G*  I'm working on getting a good excuse to get a CNC machine into my shop for 'various 'n sundry' projects...

I can 'fake' some things, job out current stuff as the company needs arise.

But it's the 'after hours' personal things that would keep me out of these forums that would keep me dulling bits...*L*  Doesn't need to be SOTA....

(Leaden Hint) ;)