To Silicon Valley insiders, Mike Moritz of Sequoia Capital, an investor in both Yahoo and Google, is by now without much debate the tech industry's leading venture capital investor. You wouldn't know it from panels at the big tech conferences, at which Moritz never appears, or from the press, which the former Time correspondent tends, with a few lapses, to avoid. His role-model? His discretion probably owes less to his Britishness than to the style of the legendary Arthur Rock, an early investor in Intel and Apple Computer. I dug out a copy of Moritz's 1984 book on Apple's founding: "Rock shunned publicity, had never been the subject of a long newspaper or magazine profile, hardly ever appeared at meetings of venture-capital associations, was formidably discreet about his investments, and conducted most of his business either from an office on San Francisco's Montgomery Street or from a $450,000 three-storey condominium in Aspen."