Bruce Corman Norbert Greenwald (born August 15, 1946)^[1] is an American economist and professor at Columbia University's Graduate School of Business and an advisor at First Eagle Investment Management. He is, among others, the author of the books Value Investing: from Graham to Buffett and Beyond and Competition Demystified: A Radically Simplified Approach to Business Strategy. He has been referred to by The New York Times as "a guru to Wall Street's gurus"^[2] and is a recognized authority on value investing, along with additional expertise in productivity and the economics of information.

Greenwald received a B.S. in electrical engineering from MIT in 1967, a M.S. in electrical engineering and M.P.A. from Princeton University in 1969, and a Ph.D. from MIT in economics in 1978. Before arriving at Columbia in 1991, Greenwald was a research economist at Bell Laboratories and later Bell Communications Research, and an assistant professor at Harvard Business School.^[3]

• Competition Demystified: A Radically Simplified Approach to Business Strategy (2005)
• Value Investing: From Graham to Buffett and Beyond (2001)
• Value Investing: From Graham to Buffett and Beyond 2nd Edition (2020)

• Value investing
• Benjamin Graham
• David Dodd
• Warren Buffett