1951 : obtained a Master's degree in economics

He obtained a Master's degree in economics in 1951 at Columbia Business School, studying under Benjamin Graham, alongside other future value investors including Walter Schloss and Irving Kahn. Another influence on Buffett's investment philosophy was the well known investor and writer Philip Fisher. After receiving the only A+ Benjamin Graham ever handed out to a student in his security analysis class, Buffett wanted to work at Graham-Newman but was initially turned down. He went to work at his father's brokerage as a salesman until Graham offered him a position in 1954. Buffett returned to Omaha two years later, when Graham retired.