A shared law-school connection may influence judicial decisions even in cases where impartiality is a fundamental institutional requirement, according to new research published in Economic Inquiry. An analysis of Florida medical malpractice litigation found that plaintiffs were approximately 2 percentage points more likely to recover damages when their attorney had attended the same law school as the judge presiding over the case. The finding suggests that a seemingly ordinary alumni relationship can shape outcomes in high-stakes legal proceedings, raising new questions about how courts should address professional ties that may be subtle, informal, and difficult to detect.
The study, titled “Alumni Relationships and Judicial Bias,” examined medical malpractice cases in Florida in which judges were assigned randomly. This feature of the legal system provided the researchers with a powerful way to investigate potential bias. If lawyers could anticipate which judge would hear a case, they might choose strategies, venues, or even litigation schedules that favored their clients. Random assignment reduces that concern because the identity of the presiding judge is not systematically selected by the attorney according to the judge’s background or expected sympathies. It therefore allows researchers to compare cases involving judges who differed in their educational relationships with the lawyers appearing before them.
The researchers focused on whether a judge and a plaintiff’s attorney had attended the same law school. Their central result was a measurable increase in the likelihood that the plaintiff recovered damages when this alumni connection existed. The estimated increase was about 2 percentage points, a modest shift in absolute terms but a potentially consequential one in medical malpractice litigation, where cases can involve substantial financial losses, complex expert testimony, and life-changing injuries. A small change in the probability of recovery can translate into meaningful consequences for litigants, attorneys, insurers, and the broader cost of medical liability.
The analysis is important because it attempts to distinguish a genuine alumni effect from other forms of similarity between judges and lawyers. People who attended the same law school may share professional norms, social networks, geographic backgrounds, or perceptions of institutional identity. They may also resemble one another in ways unrelated to their education. To test whether the result simply reflected general familiarity or status, the researchers examined comparisons involving judges and lawyers who attended different law schools of similar rank. Those comparisons did not produce a comparable effect, suggesting that the finding was not explained merely by the prestige or perceived quality of the institution attended.
The researchers also found no similar pattern when judges and attorneys shared the same gender or minority status. That result narrows the possible explanations for the finding. It indicates that the observed relationship was not a broad consequence of judges favoring lawyers who resembled them on readily visible demographic characteristics. Instead, the result was specifically associated with a shared law-school affiliation, a connection that may carry professional and social meaning without necessarily being obvious to observers outside the legal community.
The study identified another important feature: the effect was strongest when the judge was at least 10 years older than the attorney. This age pattern is consistent with an age-dependent mechanism in which a judge may feel a stronger connection to a younger lawyer who attended the same institution, perhaps because the judge sees the attorney as part of a continuing educational or professional lineage. It may also reflect differences in career experience, status, or the ways alumni relationships are expressed across generations. The researchers describe the age interaction as evidence that the effect is not simply a mechanical consequence of two people having attended the same school.
From a technical perspective, the study illustrates how quasi-experimental research can be used to investigate behavior in institutions where direct observation of motives is difficult. A judge’s decision is influenced by the facts of a case, legal arguments, evidence, procedural rules, and the credibility of witnesses. Many of these factors are challenging to measure comprehensively. Random judicial assignment helps address one major source of confounding by making the judge’s identity independent of the parties’ strategic choices. The researchers can then estimate whether outcomes change systematically when an otherwise comparable case is heard by a judge who shares an educational affiliation with the plaintiff’s attorney.
The findings do not establish that every judge with an alumni connection consciously favors a former fellow student, nor do they show that shared school attendance changes the legal reasoning in every case. Judicial decisions may be shaped by unconscious familiarity, increased trust, communication patterns, expectations about professional competence, or subtle forms of social affiliation. The research detects an outcome pattern rather than identifying a single psychological process behind it. Even so, the combination of random assignment, comparisons across similarly ranked schools, and tests involving gender, minority status, and age strengthens the case that the relationship is meaningful rather than a statistical artifact.
The results also carry practical implications for judicial ethics and courtroom procedure. Courts commonly require disclosure of relationships that could create an appearance of partiality, but rules differ in how they treat alumni connections. A shared law school may be viewed as too remote to require recusal, particularly when many judges and attorneys have overlapping professional networks. Yet the new evidence suggests that educational ties can be associated with measurable differences in case outcomes. The study therefore raises the possibility that courts, bar associations, and policymakers may need to reconsider when such relationships should be disclosed, reviewed, or evaluated alongside other potential conflicts of interest.
“Courts are designed to deliver impartial justice, yet our findings show that something as simple as a shared law school can affect whether plaintiffs recover damages,” said corresponding author David Zhang of Rice University. He noted that the findings raise important questions about when ties between judges and lawyers should be disclosed or lead to recusal. Co-author Tianwang Liu, an independent researcher, emphasized that observable similarities alone do not explain the pattern and that rigorous data collection and research design can reveal influences that would otherwise remain hidden. As legal systems increasingly rely on empirical analysis to evaluate fairness, the study offers a striking reminder that bias may arise not only from ideology or personal identity, but also from the quiet professional networks formed long before a case enters the courtroom.
Subject of Research: Judicial bias and the influence of shared law-school affiliations in Florida medical malpractice cases.
Article Title: Alumni Relationships and Judicial Bias
News Publication Date: 19-Aug-2026
Web References: Economic Inquiry: https://onlinelibrary.wiley.com/journal/14657295; DOI: https://doi.org/10.1111/ecin.70080
References: Zhang, David, and Tianwang Liu, “Alumni Relationships and Judicial Bias,” Economic Inquiry, DOI: 10.1111/ecin.70080.
Keywords: judicial bias, legal system, medical malpractice, judicial assignment, law-school alumni, courtroom impartiality, social networks, behavioral psychology, legal economics
