Cliff Asness
Co-founder of AQR Capital Management
Born 1966
Helped bring academic factor research, including value and momentum, into large-scale systematic investment products.
Biography
Cliff Asness is an American investor, born in 1966, who co-founded AQR Capital Management in 1998. His significance for ordinary investors is that he sits at the point where academic asset pricing research became investable products: the value and momentum patterns documented in journals were turned into systematic strategies run at scale.
He completed a PhD at the University of Chicago, where Eugene Fama supervised his dissertation on momentum, and worked in quantitative research at Goldman Sachs Asset Management before founding AQR. That path matters to the story, because his work has consistently tried to hold together two ideas that the academic literature had treated separately: that cheap assets tend to outperform, and that recent winners tend to keep winning.
Asness is also unusually direct in public writing about the difficulty of the approach. Much of his commentary concerns not whether factors exist but whether investors can actually hold them through the long stretches when they do not work, which he has argued is the binding constraint in practice.
Career timeline
- 1966Born in Queens, New York.
- 1994Completes a PhD at the University of Chicago, supervised by Eugene Fama.
- 1990sLeads quantitative research at Goldman Sachs Asset Management.
- 1998Co-founds AQR Capital Management.
- 2013Co-publishes "Value and Momentum Everywhere" in the Journal of Finance.
How he approaches investing
The systematic approach Asness represents starts from patterns measured across long histories and many markets, and then applies them by rule rather than by judgment on individual securities. The argument for rules is not that they are cleverer but that they are consistent, and consistency is what a discretionary process tends to lose under pressure.
His public writing repeatedly returns to a second point: that the hardest part is not identifying a strategy with good long-run evidence but staying invested in it. A factor can underperform for a decade, which is long enough that most investors abandon it, and that abandonment is itself part of why the pattern persists.
Key ideas
Tap any idea to expand a plain-English explanation, why it matters, and where to learn more.
Value and momentum together
Buying what is cheap and buying what has recently performed well are both documented patterns, and they tend to work at different times.
Because the two are negatively correlated, combining them has historically produced a steadier result than either alone.
Periods that are poor for cheap assets have often been periods when recent winners continued to do well.
Rules over discretion
Applying a strategy systematically removes the case-by-case judgments where inconsistency enters.
It makes a process repeatable and testable, and it removes the temptation to make an exception at the worst moment.
A rule for rebalancing executes during a downturn, when a discretionary decision would be hardest.
Implementation is the constraint
The gap between a documented pattern and a realised return is trading costs, taxes, capacity and the investor’s ability to persist.
It explains why a strategy that looks strong in a backtest can disappoint in practice without the underlying research being wrong.
A factor premium measured before costs may be substantially smaller once trading and tax drag are included.
Major contributions
- Co-founded AQR Capital Management, one of the firms that brought systematic factor strategies to institutional scale.
- Co-authored research documenting value and momentum effects across multiple asset classes and markets.
- Wrote extensively in public about the practical difficulty of holding factor strategies through long underperformance.
Important books
- Value and Momentum Everywhere2013
A journal article rather than a book, written with Tobias Moskowitz and Lasse Pedersen, documenting both effects across asset classes and markets.
Influence on investors
The factor products now available to ordinary investors, including funds that tilt toward value or momentum, exist partly because firms like AQR demonstrated the research could be implemented at scale. His public writing has also been unusually frank about the periods when the approach does not work, which is rarer than it should be.
Criticisms and debates
A balanced view includes the main criticisms and open debates, presented neutrally.
- Factor strategies have experienced long stretches of underperformance, and critics question whether documented premiums survive after costs and crowding.
- Backtested results depend on assumptions about trading costs and capacity that are difficult to verify from outside a firm.
- Some argue that widely publishing and productising a factor reduces or removes the premium that made it attractive.
Lessons for investors
Plain-English takeaways. Context for learning, not advice to buy or sell anything.
- 1Judge a strategy by whether you could hold it through a decade of disappointment, not only by its long-run average.
- 2Include trading costs and taxes before comparing a strategy against a simple broad-market alternative.
- 3Prefer a rule you will actually follow to a better rule you will abandon.
Notable quotes
“Investing is about having a strategy you can stick with, not the theoretically best one.”
Frequently asked questions
Who is Cliff Asness?
Cliff Asness is an American investor born in 1966 who co-founded AQR Capital Management in 1998. He completed a PhD at the University of Chicago supervised by Eugene Fama.
What is systematic or quantitative investing?
An approach that applies rules derived from measured historical patterns rather than making case-by-case judgments about individual securities.
Why combine value and momentum?
The two patterns have historically worked at different times, so combining them has produced a steadier result than either on its own. This is an observation about the historical record, not a prediction.
Why do factor strategies underperform for long periods?
Documented premiums are long-run averages, not steady returns. Asness has argued the practical difficulty is that these stretches are long enough that most investors abandon the approach.
Related quotes
Other people in the library writing on the same themes.
Strategies Cliff Asness is associated with
How the money actually gets run, with the mechanics, the costs and the failure modes set out in full.
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