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A Silicon Valley technology executive and his Stanford University faculty wife have pledged to give Stanford Hospital a $27.5 million gift to build a state-of-the-art emergency department when the university builds its new hospital.

Marc Andreessen and his wife, Laura Arrillaga-Andreessen, made the commitment as their first philanthropy decision as a married couple, the university announced Friday.

Andreessen built two billion-dollar companies while his wife, a Stanford business school faculty member, has made a career of practicing venture philanthropy.

Andreessen, 36, is a software engineer who developed the Mosaic, a widely used Web browser. He founded Netscape Communications when he was 23, sold it to America Online in 1998 for $4.2 billion in stock, and then founded Opsware, a data center automation company.

Arrillaga-Andreessen, 37, has master’s degrees from Stanford in business, education and art history. She has been on the Stanford faculty since 2000.

“Both of us feel so strongly that, being part of the new generation in Silicon Valley, we have a responsibility to hopefully inspire other people in our age range to make significant philanthropic commitments,” said Arrillaga-Andreessen, who grew up in Palo Alto.

“Everybody walks into the Emergency Department at some point, and it may be 2 a.m.,” Andreessen said. “This means we could have a big impact. The opportunity to build a new emergency services department that is world-class is enormous.”

The university plans to replace Stanford Hospital with a new hospital by 2015. The plans for construction of the new hospital are underway.

— Don Kazak

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— Don Kazak

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— Don Kazak

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