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

I worked for ARINC Aeronautical Radio INC down at FAA HQ. ARINC was the engineering company hired by the Government a long time ago to assess the aviation requirements for tube electronics, mostly radios which as fate would have it were still in abundant use by the Airline industry and the FAA as late as 1986 when solid state radios replaced them. ARINC developed standards for avionics and when I was there was involved in all aspects of Aviation industry communications systems.

I have to change my vote. After reading the above, I would like to have worked with geoffkait.

Today/Current - Bruce Thigpen - Eminent Technology - just call me Bruce I am coming to Florida on my Canadian dime.  

Past
Peter Walker era - Quad
John Bowers era - B&W
Roger - Music Reference
J.C. Verdier - Turntables

Nelson Pass of Pass Labs of course Erik!
Happy Listening
Mark

Adding some designer/manufacturers from the (distant) past to my previous post, which only addressed those who are presently active:

-- Saul Marantz & Sid Smith, at you know which company.

-- H. H. Scott & Daniel von Recklinghausen (at the original H. H. Scott company). I believe, btw, that it was Daniel von Recklinghausen who first said "If it measures good and sounds bad, it is bad. If it sounds good and measures bad, you’ve measured the wrong thing."

-- Lincoln Walsh (Brook Electronics, which manufactured high quality amplifiers using 2A3 directly heated triode power tubes in the late 1940s and early 1950s; also the creator of the Walsh driver later used in Ohm speakers).

-- E. H. Scott (no relation to H. H.), who manufactured high quality multi-chassis "radios" mainly in the 1930s (many using 2A3 and 45 power tubes), which can be considered to be precursors of modern hifi systems.

-- McMurdo Silver, a competitor of E. H. Scott; same description applies.

Best regards,
-- Al