Dan D 'Agostino, Mark Levinson, Jim Thiel,

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What happens to the sound, quality and everything else to the products of a company when the founder leaves? Do the original companies sustain their lustre they had in their heyday under the founder?

Dan D 'Agostino (Krell), Mark Levinson, Jim Thiel, Arnie Nudell (Inffinity) and Bob Carver(Carver Corp & Sunfire) left companies they founded to be run by others. Can you name any others that left to start up elsewhere? How did their old companies fare after they left?
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