Benjamin Abraham Horowitz is a venture capitalist and technology entrepreneur, best known as the co-founder of the Silicon Valley firm Andreessen Horowitz (a16z, founded 2009, managing billions in assets). Born in London, England, and raised in Berkeley, California, he is one of David Horowitz's four children and the son from his first marriage to Elissa Krauthamer; of Ashkenazi Jewish descent, his great-grandparents were Jewish immigrants from the Russian Empire. Horowitz earned a BA in Computer Science from Columbia University (1988) and an MS from UCLA (1990). His career includes roles as an engineer at Silicon Graphics (1990), product manager at Netscape (joined 1995 with Marc Andreessen), vice president of Netscape's Directory and Security Product Line (1997-1998) and eCommerce Division at AOL (post-acquisition), co-founder and CEO of Loudcloud (1999, public 2001; rebranded Opsware 2002; sold to Hewlett-Packard for $1.6 billion in 2007), and VP and General Manager at HP Software (2007-2008). He is the author of The Hard Thing About Hard Things (2014) and What You Do Is Who You Are (2019). In personal life, he has been married to Felicia Wiley since 1988 and has three children; he is an avid hip-hop fan. Politically, he donated $3 million to MAGA Inc., a pro-Trump super PAC, in the first half of 2025. His net worth is estimated at $1.5-3.5 billion as of 2024-2025. Online, he is active on X (@bhorowitz) and Instagram (@bhorowitz0).