Levinson wasn't the engineer who designed the components; that was Tom Colangelo, who went on with Levinson to form Cello. Levinson isn't a EE, he's a musician / recording engineer sort of guy.
Levinson the man moved on from Mark Levinson the company before 1984, so the brand name has been without its name sake for a very long time.
To give credit where credit is due, it should also be mentioned that several of the earliest products of the original Mark Levinson Audio Sytems company, headed by Mark Levinson, were designed by John Curl. Tom Colangelo assumed primary design responsibility a bit later.
Re the post early in the thread by Charles1dad, I too have seen a considerable number of comments in recent years about the difficulty and expense that are involved in getting ML equipment serviced.
Best regards,
-- Al