Ben Horowitz — Education: B.A. Computer Science, Columbia University; M.S. Computer Science, UCLA

Note: The source text explicitly states that Ben Horowitz earned a B.A. from Columbia University and an M.S. from UCLA, both in computer science. This directly confirms all components of the claim: the degrees (B.A. and M.S.), the fields (Computer Science for both), and the institutions (Columbia University and UCLA). The source also confirms the degrees in the infobox section listing 'Columbia University (BA)' and 'University of California, Los Angeles (MS)'.