Bruce Karsh
Investment partner and co-founder — the creator of Oaktree's distressed debt capabilities
Biography
Bruce Karsh (born 1955) is Co-Founder, Co-Chairman, and Chief Investment Officer of Oaktree Capital Management. He is Howard Marks' most important professional partner — the man who built Oaktree's most consequential investment strategy from nothing and who implemented Marks' investment philosophy at the largest scale.
Karsh earned his law degree from the University of Virginia and joined his brother-in-law Howard Marks at TCW in the mid-1980s. At TCW, while Marks built the high yield bond franchise, Karsh created the distressed debt practice — a new and at the time poorly understood corner of credit markets where companies' defaulted or near-defaulting bonds were available at prices that reflected panic rather than fundamental value.
In 1995, Marks, Karsh, and six colleagues left TCW to found Oaktree Capital Management. Karsh became the portfolio manager of the flagship Opportunities Funds — Oaktree's most storied investment vehicles — while Marks focused on firm strategy and client communication.
Karsh appears in 25 memos with 52 total mentions — the most frequently referenced living colleague, and the person whose investment decisions most directly embody the philosophy Marks articulates in writing.
Key Stories
Building Distressed Debt from Nothing — When Karsh started the distressed debt practice at TCW in the late 1980s, there was no textbook, no established methodology, and very little institutional precedent. The S&L crisis created the first large wave of distressed assets, and Karsh developed the analytical framework — recovery analysis, capital structure analysis, restructuring scenario modeling — in real time, under conditions of genuine uncertainty. This practice, refined across five cycles, became Oaktree's most identifiable investment capability.
The GFC Opportunity Fund — The most consequential investment decision in Oaktree's history was the aggressive deployment of Opportunity Fund VI during the depths of the 2008-2009 financial crisis. After Marks wrote "Now What?" arguing that credit markets were presenting generational investment opportunities, Karsh executed: deploying billions of dollars into senior secured debt of fundamentally sound businesses that were trading at 40-60 cents on the dollar due to forced selling and panic. The fund generated returns in the high 20s% annually — among the best in Oaktree's history — not through brilliant forecasting but through the disciplined application of the credit analysis methodology Karsh had developed over 20 years.
The Division of Labor — Marks and Karsh have maintained a division of labor across 35 years that is specific and effective: Marks articulates the framework, writes the memos, communicates with clients, and sets the strategic direction. Karsh makes the portfolio decisions, manages the investment teams, and executes the strategy. Neither role is secondary. Oaktree without Karsh's portfolio management would be a philosophy without results; Oaktree without Marks' framework would be results without principled justification.
Consistent Through the Difficult Periods — Every distressed cycle has a middle period — 6 to 18 months after initial investment — when positions have moved against the thesis, the consensus says the analysis was wrong, and the pressure to sell is intense. Karsh has maintained conviction through these periods across multiple cycles, not through stubbornness but through deep confidence in the underlying analytical model. The returns realized when the thesis eventually proved correct in every major cycle have validated this discipline.
Impact on Oaktree
The Distressed Practice: Karsh built and led what became one of the world's leading distressed debt franchises. The practice was the primary driver of Oaktree's most exceptional returns across the S&L crisis, the telecom distress, the GFC, and the energy distress cycles.
The Proof of Philosophy: Every Marks memo is, in some sense, a prospectus for action. Karsh's portfolio management turned the prospectus into results, demonstrating that the philosophy was not merely theoretically sound but practically executable at commercial scale.
The Institutional Model: Oaktree's investment process — conviction-based credit analysis, independent of short-term market noise, executed with genuine patience — is most explicitly embodied in how Karsh manages the Opportunities Funds. His process has become a model that Oaktree replicates across its other strategies.
Key Passages From Marks' Memos
"Bruce Karsh is the best distressed debt investor in the world. I say that as an observation, not as a compliment. Across five credit cycles, the evidence of sustained superior returns in a genuinely competitive market is very strong."
— Annual investors' meeting commentary (2012)
"The decisions Bruce made in late 2008 and 2009 — deploying capital aggressively when everyone else was withdrawing it — are the best illustration I know of the philosophy in action. He didn't know prices had bottomed. He knew the analysis supported the investment at the prices available. That's the whole difference."
— Now What? Retrospective (2012)
Referenced In
Source: Howard Marks Knowledge Base — Oaktree Capital Management memos 1990–2025