Medicine is, among other things, a discipline for making decisions under uncertainty. A physician rarely has perfect information. The patient's history is incomplete, test results conflict, and the cost of being wrong can be high. Training is largely about building habits that lead to good decisions anyway. Several of those habits carry over naturally to investing.
The first is to take a full history. In medicine, much of the diagnosis comes from listening carefully before ordering a single test. In underwriting, the equivalent is understanding the people and the past before the spreadsheet: how the sponsor has handled difficult deals, why the seller is selling, what the tenant or customer has done over time. The model matters, but it is built on that history.
The second is to look for what does not fit. Clinicians learn that the detail out of place, the symptom that does not match the rest of the picture, is often the important one. In a deal, it might be an expense line that changed sharply, a lease clause that seems unusual, or an assumption that only works if everything goes right. Those details deserve the most attention, not the least.
The third is to think in terms of the worst plausible outcome, not the expected one. Before a procedure, a physician asks what could go wrong, how likely it is, and whether the patient could recover from it. An investor can ask the same questions: what happens if rents fall, if a key person leaves, if refinancing is not available on the terms assumed? If the answer is a loss the family could not accept, the expected case is irrelevant.
The fourth is to respect the second opinion. Good physicians seek out colleagues who will challenge their thinking. In investing, that means welcoming a sponsor who pushes back, consulting people who know an asset class better than we do, and being willing to change our minds when the evidence changes.
Finally, medicine teaches that doing nothing is sometimes the right treatment. Not every symptom calls for an intervention, and not every opportunity calls for capital. Waiting, gathering more information or declining entirely are legitimate decisions. A family office free of pressure to deploy capital can make them without apology.
None of this is a formula, and training in one field does not guarantee good judgement in another. But the habits of careful listening, attention to anomalies, respect for the downside and humility about one's own view are useful anywhere decisions carry real consequences. They shape how we approach every opportunity we see.