Citation
Gugliuzza, P. R., Nash, J. R., & Rantanen, J. (2023). Expertise, ideology, and dissent. Emory Law Journal, 72, 1599–1660. https://scholarlycommons.law.emory.edu/cgi/viewcontent.cgi?article=1309&context=faculty-articles
Research Question
How do judicial expertise, political ideology, and collegial dynamics shape voting and dissenting behavior on the U.S. Court of Appeals for the Federal Circuit across its full merits docket?
Key Takeaways
Dissents and concurrences on the Federal Circuit are rare but follow strong judge-specific and case-specific patterns; A small subset of judges, especially Judge Newman, account for a disproportionate share of separate opinions, making panel composition empirically important; Reversal cases are significantly more likely to generate dissents, signaling especially high-stakes doctrinal conflicts; Subject-matter expertise affects who writes and sometimes how judges vote, but it does not fully determine dissent behavior; Traditional partisan ideology explains relatively little compared with other circuits, with weak evidence of stable ideological camps; Visiting and designated judges are less likely to write separately, indicating higher collegiality costs and more deferential behavior.
Dataset Description
The study builds on the Federal Circuit Dataset Project to assemble a comprehensive dataset of all Federal Circuit merits decisions from 2008 through 2021. It includes precedential and nonprecedential opinions and Rule 36 summary affirmances, spanning thousands of panel decisions and tens of thousands of individual judge-votes. For each case, the authors code subject matter (e.g., PTO appeals, district court patent cases, Court of Federal Claims, veterans and government benefits, trade), tribunal of origin, procedural posture, disposition (affirm, reverse, mixed), and opinion type (authored opinion, per curiam, Rule 36). At the judge-vote level, they code the author of the majority and any separate opinions, presence and type of dissents and concurrences, whether the judge is a Federal Circuit judge or sitting by designation, prior patent or technical experience, and ideology proxies such as appointing President’s party and party-of-appointing President alignment on the panel. The resulting dataset covers both patent and non‑patent cases and allows analysis of dissenting, concurring, and reversal patterns over time and across subject areas.
Methodology
statistical/quantitative
Key Findings
The authors find that dissents on the Federal Circuit are relatively rare, appearing in only a small fraction of merits decisions, but they are highly structured rather than random. A few judges, most notably Judge Newman, dissent at rates far higher than their colleagues, and judge-specific propensities to write separately remain stable across subjects and over time. Separate opinions are more likely in reversals than affirmances, indicating that panel disagreement is most visible in cases that disrupt the status quo. Judicial expertise plays a meaningful but circumscribed role: judges with prior patent or technical backgrounds are more likely to author opinions in patent-heavy cases and can show distinctive voting patterns, yet expertise does not fully explain dissent rates or align separate opinions along technical/nontechnical lines. Conventional ideology, as proxied by the appointment of the President, has weaker explanatory power than in the regional circuits. The data reveal little systematic pattern of partisan–majority–dissent alignment, and ideological blocs are not consistently observed, even in salient patent disputes. Visiting judges and judges sitting by designation dissent and concur at lower rates, suggesting they internalize stronger collegiality norms and higher perceived costs of publicly disagreeing with the court’s permanent members. Overall, the evidence supports a multidimensional account of Federal Circuit behavior in which expertise, institutional role, and interpersonal dynamics interact to shape when judges publicly register disagreement, while simple left–right ideology plays only a modest role.
Summary
This article conducts a large-scale empirical study of judicial behavior on the U.S. Court of Appeals for the Federal Circuit, focusing on how expertise, ideology, and collegial dynamics shape dissenting and concurring practices. Rather than limiting attention to high-profile patent decisions, the authors analyze the court’s entire merits docket from 2008 through 2021, including precedential and nonprecedential opinions as well as Rule 36 summary affirmances. By coding every judge-vote and opinion type, they can move beyond anecdote to identify systematic patterns in when judges choose to disagree publicly with their colleagues.
The core theoretical frame is that dissents are costly signals. Writing separately takes time, can strain collegial relationships, and may invite criticism, but also allows judges to express strongly held views, shape doctrinal trajectories, and speak to higher courts or future panels. The authors, therefore, treat dissent as the product of both individual preferences and institutional constraints. They then test how judge-level factors (such as subject-matter expertise and whether the President appoints the judge), case characteristics (such as subject area and whether the court reverses), and panel composition (including the presence of visiting judges) affect the probability of a dissent or concurrence.
The results show that Federal Circuit disagreement is heavily concentrated among a handful of judges and, in particular, in certain configurations of cases. Judge Newman’s dissent rate is several times that of most colleagues, and more generally, individual judges exhibit stable, judge-specific propensities to write separately that cannot be reduced to ideology alone. Dissents and concurrences are substantially more likely in reversals, where doctrinal stakes are higher, and visiting judges are noticeably less inclined to depart from the majority, consistent with heightened collegiality costs for outsiders. Expertise matters most for opinion assignment and participation in patent-heavy cases, but it does not neatly segment judges into pro- and anti-patent camps.
On questions of ideology, the Federal Circuit departs from the pattern seen in regional circuits. Using the President’s appointment as a proxy, the authors find only modest relationships between partisan background and voting or dissenting behavior. Majorities and dissents do not consistently divide along party lines, and stable ideological coalitions are hard to identify, especially when both patent and non-patent matters are analyzed together. Instead, the court’s semi-specialized jurisdiction and shared commitment to technical areas seem to dampen overt ideological conflict, even as individual judges retain distinctive voices and recurring patterns of separate writing.
The article concludes that judicial behavior on the Federal Circuit is structured but multidimensional. Expertise, institutional role, and interpersonal dynamics all leave measurable fingerprints on who writes, who dissents, and when disagreements become visible in the law, while simple left–right ideology plays a comparatively limited role. For scholars, this underscores the need for theories of judicial behavior that account for semi-specialized courts and heterogeneous expertise. For practitioners, it suggests that careful attention to judge-level patterns, reversal posture, and panel composition may be more informative for predicting disagreement and potential en banc or Supreme Court interest than relying on partisan heuristics alone.
How the Study Advances Empirical Understanding of Legal Outcomes
The study finds that outcomes on the Federal Circuit exhibit structured, repeatable patterns in dissenting and concurring behavior that are systematically related to institutional context, case posture, and panel composition, rather than occurring randomly. The analysis shows that reversal posture, subject matter, and the presence of visiting judges shape when disagreement becomes visible, underscoring how decision environments and collegial norms condition the expression of legal conflict within a specialized appellate court. By assembling a comprehensive, case-based dataset and examining outcomes across the full merits docket, the study reflects an empirical approach aligned with Pre/Dicta’s emphasis on grounding high-level litigation understanding in observed patterns of judicial decision contexts rather than anecdote or intuition.
