Benjamin Graham
Intellectual grandfather — foundational influence, especially margin of safety and Mr. Market
Biography
Benjamin Graham (1894–1976) was a British-born American investor, professor, and author who founded the discipline of securities analysis. He is widely recognized as the intellectual father of value investing — the dominant approach to fundamental investment management for the past century.
Graham grew up in New York in poverty after his father's death left the family destitute. He graduated from Columbia University in 1914, was offered teaching positions in mathematics, English, and philosophy, and chose instead to join a Wall Street firm. By the late 1920s he was running his own fund. The 1929 crash nearly wiped him out — a formative experience that permanently shaped his insistence on a large margin of safety as the foundation of any investment.
After the crash, Graham spent the rest of his career systematically developing the analytical framework that would transform investing from a blend of speculation and guesswork into a discipline with identifiable principles. Security Analysis (1934, co-authored with David Dodd) became the foundational text of institutional investment analysis. The Intelligent Investor (1949) translated the principles for a general audience, became a perennial bestseller, and was called by Buffett "by far the best book on investing ever written."
Graham appears in 17 Oaktree memos with 59 total mentions. His ideas are present in almost every memo even when he is not named — his concepts are so deeply embedded in Marks' framework that they are the invisible structure of the entire knowledge base.
Key Stories
The 1929 Crash as Teacher — Graham's fund was nearly destroyed in the Great Crash. He lost most of his investors' money and spent years rebuilding. This experience — of seeing how catastrophically wrong optimistic assumptions can be, of confronting the full consequences of insufficient margin of safety — shaped his entire analytical framework. The margin of safety concept is not an academic construct; it was born of devastating personal experience with what happens when it is absent.
Mr. Market — Graham's most enduring contribution to investment psychology is not an analytical formula but an allegory. He asks you to imagine a business partner named Mr. Market who shows up every day offering to buy your share of the business or sell his at a specific price. Mr. Market is a manic-depressive: sometimes exuberantly optimistic (offering prices far above intrinsic value), sometimes deeply pessimistic (offering prices far below). The investor's job is to take advantage of Mr. Market's irrationality, not be influenced by it. Marks uses this allegory throughout his memo corpus to describe the credit market's oscillation between boom and bust — and the opportunities those oscillations create.
The Graham-Newman Connection — Three of the most important investors of the 20th century worked at Graham's firm: Warren Buffett, Walter Schloss, and others. Graham trained them not in stock-picking techniques but in a way of thinking — analytical independence, insistence on evidence over opinion, margin of safety before everything. The fact that these students independently achieved extraordinary records across different markets, asset classes, and time periods is the strongest evidence that Graham transmitted something durable.
The Extension to Credit — Graham worked almost entirely in equities. His tools — net asset value analysis, earnings multiples, book value ratios — were equity instruments. Marks' most significant intellectual contribution is applying the Graham framework to credit markets, where its core principles translate with precision: intrinsic value becomes recovery value, margin of safety becomes the gap between purchase price and realistic recovery, Mr. Market's irrationality becomes the credit cycle's extreme oscillations.
Impact on Marks' Work
Margin of Safety as the Foundation: Every investment decision at Oaktree begins with the margin-of-safety calculation: what is the realistic downside, and is the purchase price far enough below it to absorb analytical error? This is pure Graham.
The Mr. Market Framework: The credit cycle — with its reliable pattern of overoptimism followed by overpessimism — is Graham's Mr. Market in a fixed-income context. Marks cites this framework to explain why the same analytical discipline that works in equities works even more reliably in credit.
Investment vs. Speculation: Graham's definition — investment is an operation which, upon thorough analysis, promises safety of principal and an adequate return; everything else is speculation — is the vocabulary Marks uses to evaluate any strategy. The definition makes risk analysis and margin of safety prerequisites for the label "investment."
The Intelligent Investor in Credit: Graham's insistence on disciplined, evidence-based analysis against the tide of market sentiment is the entire intellectual foundation of Marks' contrarian credit philosophy. Being willing to buy what the market is selling — when price is far below conservative assessments of value — is Graham's framework in credit market conditions.
Key Passages From Marks' Memos
"Graham's The Intelligent Investor is the best investment book ever written. Not one of the best — the best. If you read nothing else in the field of investing, read that book. The margin of safety chapter alone is worth more than a graduate finance degree."
— Risk Revisited (2014)
"The margin of safety concept is the most important idea in investing — not the most frequently discussed, not the most fashionable, the most important. It accounts for the fact that we don't know the future, can be wrong about the present, and should act accordingly. Graham understood this in 1934. Most of the industry has not absorbed it yet."
— The Most Important Thing (2007)
"Mr. Market is not a metaphor for something unusual. Mr. Market is what the credit markets look like at every cycle extreme — offering you prices that reflect maximum fear or maximum greed rather than anything resembling fundamental value. The investor's job is to recognize which condition applies and act on it."
— On the Couch (2016)
"Graham taught that the investor's best friend is market volatility — not his enemy. Volatility creates the mispricings that make investing profitable. Without volatility, prices would always be right, alpha would be zero, and there would be nothing to do."
— Memo to Oaktree Clients (1991)
Referenced In
Source: Howard Marks Knowledge Base — Oaktree Capital Management memos 1990–2025