Insiders say another Silicon Valley chief executive is about to step down just weeks after John Sculley quit as CEO of Apple Computer. Nat Goldhaber, president and CEO of Kaleida Labs, the multimedia joint venture between Apple and IBM, may soon be vacating the corner office. Goldhaber couldn't be reached, and Kaleida declined to comment. But Silicon Valley sources say Goldhaber, the co-founder of networking company Tops and aformer meditation instructor, has come under criticism from Kaleida's parent companies for not persuading companies to adopt Kaleida's technology.

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