Origins & Early Life

Marc Lowell Andreessen ( an-DREE-sən; born July 9, 1971) is an American businessman, venture capitalist, and former software engineer. He is the co-author of Mosaic, the first web browser to display inline images; co-founder of Netscape; and co-founder and general partner of Silicon Valley venture capital firm Andreessen Horowitz. He co-founded and later sold the software company Opsware to Hewlett-Packard; he also co-founded Ning, a company that provides a platform for social networking websites. In 2024, he became an advisor to Donald Trump.

Pivotal Works & Achievements

As of June 2026, Forbes estimated Andreessen's net worth at $1.9 billion. Andreessen was born in Cedar Falls, Iowa, and raised in New Lisbon, Wisconsin, which he considered "the sticks". He is the son of Patricia, customer service operator at Lands' End, and Lowell Andreessen, who worked as a sales manager for the seed producer Pioneer Hi-Bred International. He has a younger brother named Jeff. Andreessen has stated that he had problematic relationships with his parents and brother, and that he did not like to talk about them.

Enduring Legacy & Impact

Andreessen discovered programming at age 12. In December 1993, Andreessen received his...

Contemporary Figures & Related Historical Timelines

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