Tamara Bishop, lead quantitative analyst in London, joined us to discuss the limits of models, why her team prioritizes critique, and how the best insights often come from questioning the prevailing view. She shares her routine, lessons learned from stress-testing, and practical advice for those starting in institutional roles.
Much of my day is spent dissecting models—how they fit, where they miss, and how they behave when the world refuses to cooperate. I work in a team that values critique over comfort. Every week, someone has to present a scenario where our assumptions failed. We walk through what went wrong, why, and how to revise or sometimes discard an approach. It’s not about finding a perfect formula; it’s about seeing patterns before they turn into problems.
The mistake I see most often is treating models as truth rather than tools. Models are only as good as the judgment behind them. We make a habit of running them through extreme, even unlikely scenarios. What matters is not whether a model fits the last five years, but how it breaks when the rules change. That’s where you find the real learning.
There was a period when a model suggested we were insulated from a specific volatility spike, but one of our juniors flagged a mismatch with recent market moves. We paused, ran new tests, and realized the protection was overstated. We changed course and avoided a significant drawdown. The lesson is simple: respect those who ask naive questions. Sometimes, the obvious mistake is the one you’re most blind to.
My advice is to stay skeptical—of models, of narratives, even of your own expertise. The best analysts I know are relentless about seeking feedback and not letting ego get in the way of a better answer. Your value isn’t in having all the answers, but in knowing how to spot and correct your own mistakes.
The biggest myth is that model sophistication equals better outcomes. Often, the most complex models hide the biggest risks because no one wants to admit they don’t understand them. Simple, well-tested approaches usually serve you better when markets get wild.
