Benjamin Abraham Horowitz is an American businessman, investor, and author. He is best known as co-founder of the venture capital firm Andreessen Horowitz, which he established with Marc Andreessen. Before his work in venture capital, Horowitz was a technology entrepreneur who co-founded Opsware, an enterprise software company where he served as president and chief executive officer. Hewlett-Packard acquired Opsware in 2007. Horowitz has authored two books about business and entrepreneurship. His first book, The Hard Thing About Hard Things: Building a Business When There Are No Easy Answers, focuses on the challenges of starting and running a business. His second book, What You Do Is Who You Are: How to Create Your Business Culture, addresses business culture and organizational development.