Designers -who's been around the longest ?


I vote for John Curl (Parasound) and Morris Kessler (SAE), both began in the late 60s. 
jonnie22
Nelson a one trick pony? What a silly thing to say; he's only the most versatile amplifier designer in the history of hi-fi! He makes amplifiers employing dozens of different circuits, of all types and topologies.

As for Frank, the topic of this thread is who's been around the longest, not achieved the most legendary status.
Nelson is essentially a one trick pony, Frank van Alstine never reached the same legendary status. Bob Carver is extremely capable. I have not heard one of his tube amps but I did once own a Fuzz Linear 700 which was a very good sounding amp in it's day and very affordable.
John Curl can design anything, from sound boards to phono stages, Concert sound systems to preamps. He has been involved with the design of some of the most highly regarded high end equipment and he is not finished yet. If John Curl's name is on it, you can bet on it being a great peace of equipment.  
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William Johnson of audio research fame and Sid Smith of Marantz fame  must  be considered.

Kenneth Stevens of cat can't  should not be overlooked.
He has continued to improve his  products and they must be reckoned with in the marketplace 

Unlike curl, pass and Tim, who are legendary designers, ken built and builds products that are arguably state of the art.

You have to be both a great engineer and know all the audiophile tricks to produce a great sounding product-and he knows them all.

For all of curls, tim’s and pass’s greatness I have never felt they produced a great sounding product that I had to have.







John Curl has been around and active for a LONG time. He is correct about high quality parts.

It’s easier and cheaper for large quantity FET manufacturers to skip a few steps in production (especially baking time) to produce chips that still meet specs. But those specs don’t necessarily carry over to quiet / low noise audio components. And the quantities of chips required for high-end audio manufacturing doesn’t justify the added expense in manufacturing.

Keith Herron has also been around for a long time, since the 70s. He designed Crate and Ampeg musical instrument electronics before forming Herron Audio.
Any designer will do. Sorry to hear about the V-FETs. The bigger problem is what John Curl has been saying -HQ parts are not produced in good numbers anymore.

The exception are the new GaN-FETs-but these are output-only devices. MSB makes a terrific resistor-DAC but this is only one co.
Are you talking about electronics? All around? Bob Carver, still alive and still designing. James Martini (JBL & Altec) + James B. Lansing. I personally don't like Nelson Pass because he bought ALL the extra Sony V-FET transistors. People like me that own V-FET amps now have no replacement parts😒, but a good designer.
I’ll clarify -when their career in design began. The (2) I mentioned are their current co.
I was going to offer Thomas Edison, but @thecarpathian won this thread with the first reply. Cheers,
Spencer
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Not aroind the longest, but for a pretty long time and very influential: Richard Vandersteen.
Don’t forget about Frank Van Alstine, a designer talented enough to diagnose and fix the problems in early ARC designs (specifically the SP-3 pre-amp). As was just posted, Tim de Paravicini (EAR-Yoshino)---a master designer pretty much ignored here on Audiogon---recently left us, as did Roger Modjeski (Music Reference). Both huge losses to hi-fi.

John Curl’s name was mentioned by the OP, but only in terms of Parasound. Though Mark Levinson’s name is on that company’s products, the early Levinson models were all designed by Curl.

Before starting his own company, Nelson Pass worked at Electrostatic Sound Systems (ESS), doing speaker-related projects.