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A technology entrepreneur who co-founded the enterprise software company Opsware, sold to Hewlett-Packard in 2007, then co-founded the venture capital firm Andreessen Horowitz with Marc Andreessen, which became one of Silicon Valley's most influential funds. He wrote The Hard Thing About Hard Things, an unusually candid account of the difficulty of running a company through near-failure, and later What You Do Is Who You Are, on building organizational culture.