Staub v. Proctor Hospital

Facts

The Uniformed Services Employment and Reemployment Rights Act (USERRA) forbids an employer to deny “retention in employment … or any benefit of employment” based on military “membership” or service obligation (38 U.S.C. § 4311(a)), and provides that a violation is established “if the person’s membership … is a motivating factor in the employer’s action” unless the employer proves it would have acted anyway (§ 4311(c)). The Court observed the statute “is very similar to Title VII,” which likewise turns on whether a protected characteristic “was a motivating factor.” (Staub, supra, 562 U.S. at p. 417.)

Vincent Staub, an angiography technician at Proctor Hospital, was an Army reservist. (Staub, supra, 562 U.S. at pp. 413–414.) “Both Janice Mulally, Staub’s immediate supervisor, and Michael Korenchuk, Mulally’s supervisor, were hostile to Staub’s military obligations.” (Id. at p. 414.) Mulally told a coworker Staub’s “‘military duty had been a strain on the department,’” and asked her to help “‘get rid of him,’” while Korenchuk called the obligations “‘a b[u]nch of smoking and joking and [a] waste of taxpayers[’] money’” and knew Mulally was “‘out to get’” Staub. (Ibid.) In January 2004, Mulally issued Staub a “Corrective Action” disciplinary warning that Staub said rested on a rule that “did not exist” and that he had not violated in any event. (Id. at p. 414.) Months later, Korenchuk reported to Linda Buck, the vice president of human resources, that Staub had violated the Corrective Action; “Buck relied on Korenchuk’s accusation … and after reviewing Staub’s personnel file, she decided to fire him.” (Id. at p. 415.) When Staub grieved that Mulally had fabricated the underlying allegation out of hostility to his service, “Buck did not follow up with Mulally about this claim” and “adhered to her decision.” (Ibid.) Staub did not contend that Buck was biased, “but that Mulally and Korenchuk … [and] their actions influenced Buck’s ultimate employment decision.” (Ibid.)

Procedural history

A jury found that Staub’s “military status was a motivating factor in [Proctor’s] decision to discharge him” and awarded $57,640. (Staub, supra, 562 U.S. at p. 415.) The Seventh Circuit reversed, holding Proctor entitled to judgment as a matter of law under its “cat’s paw” precedent, which required that the nondecisionmaker exercise “‘singular influence’” producing “blind reliance”; because “Buck looked beyond what Mulally and Korenchuk said” and “conduct[ed] her own investigation,” the court found the standard unmet. (Id. at pp. 415–416.) The Supreme Court granted certiorari and reversed. (Id. at p. 416; 560 F.3d 647, reversed and remanded.) The term “cat’s paw,” the Court noted, derives from an Aesop fable and was “injected into United States employment discrimination law by Judge Posner in 1990.” (Id. at p. 415, fn. 1.)

Issue

“[T]he circumstances under which an employer may be held liable for employment discrimination based on the discriminatory animus of an employee who influenced, but did not make, the ultimate employment decision.” (Staub, supra, 562 U.S. at p. 413.) More precisely, does a decisionmaker who lacks discriminatory animus, but who acts on reports or recommendations generated by a biased subordinate, break the causal chain — and does the decisionmaker’s “independent” review or investigation immunize the employer? (Id. at pp. 417–421.)

Holding

Reasoning

1. Federal torts borrow general tort law; the biased supervisor supplies the scienter. Construing “motivating factor,” the Court “start[ed] from the premise that when Congress creates a federal tort it adopts the background of general tort law,” under which “[i]ntentional torts … generally require that the actor intend ‘the consequences’ of an act, not simply the act itself.’” (Staub, supra, 562 U.S. at p. 417.) The mere making of a biased report is not itself an adverse employment action; but “[a]nimus and responsibility for the adverse action can both be attributed to the earlier agent … if the adverse action is the intended consequence of that agent’s discriminatory conduct. So long as the agent intends, for discriminatory reasons, that the adverse action occur, he has the scienter required.” (Id. at p. 419.)

2. The decisionmaker’s judgment is not a superseding cause. Rejecting the argument that the ultimate decisionmaker’s independent judgment cuts off liability, the Court explained that “it is axiomatic under tort law that the exercise of judgment by the decisionmaker does not prevent the earlier agent’s action … from being the proximate cause of the harm.” (Staub, supra, 562 U.S. at p. 419.) “[I]t is common for injuries to have multiple proximate causes,” and the decisionmaker’s judgment is not a “superseding cause,” which exists “only if it is a ‘cause of independent origin that was not foreseeable.’” (Id. at p. 420.) Proctor’s contrary rule would let an employer escape liability simply by vesting decisions in an official who reviews a personnel file — “effectively shield[ing]” it “from discriminatory acts and recommendations of supervisors that were designed and intended to produce the adverse action.” (Id. at p. 420.)

3. No automatic “independent investigation” safe harbor. The Court “decline[d] to adopt” a “hard-and-fast rule” that a decisionmaker’s independent investigation and rejection of the animus allegations negates the prior discrimination. (Staub, supra, 562 U.S. at p. 420.) The dividing line is proximate cause: “if the employer’s investigation results in an adverse action for reasons unrelated to the supervisor’s original biased action … then the employer will not be liable,” but “the supervisor’s biased report may remain a causal factor if the independent investigation takes it into account without determining that the adverse action was, apart from the supervisor’s recommendation, entirely justified.” (Id. at p. 421.) “We are aware of no principle in tort or agency law under which an employer’s mere conduct of an independent investigation has a claim-preclusive effect.” (Ibid.) Because “the independent investigation relies on facts provided by the biased supervisor — as is necessary in any case of cat’s-paw liability — … the employer … will have effectively delegated the factfinding portion of the investigation to the biased supervisor.” (Id. at p. 421.)

4. Application and reserved questions. On the facts, the Court found evidence that Mulally and Korenchuk acted within the scope of employment, were motivated by hostility to Staub’s service, had “the specific intent to cause Staub to be terminated,” and that their actions “were causal factors underlying Buck’s decision,” so the Seventh Circuit “erred in holding that Proctor was entitled to judgment as a matter of law.” (Staub, supra, 562 U.S. at pp. 422–423.) It remanded for the Seventh Circuit to decide whether the imperfect jury instruction was harmless or required a new trial. (Id. at p. 423.) In a footnote, the Court “express[ed] no view” on whether a non-supervisory co-worker’s cat’s-paw act would create liability, or whether an employer’s grievance process could furnish an affirmative defense. (Id. at p. 422, fn. 4.)

5. The Alito concurrence. Justice Alito, joined by Justice Thomas, concurred in the judgment but would have reversed “based on the statutory text, rather than principles of agency and tort law.” (Staub, supra, 562 U.S. at p. 424 (conc. opn. of Alito, J.).) In his view, discrimination must be “‘a motivating factor’” “in the mind of … the person who makes the decision,” but the employer is nonetheless liable where the formal decisionmaker “merely rubberstamps the recommendation of others,” because it has then “actually delegated the decisionmaking responsibility” to the biased actors — or where the decisionmaker, “put on notice” of possible animus, “does not undertake an independent investigation.” (Id. at pp. 424–425.)

Significance

Staub is the Supreme Court’s foundational statement of “cat’s paw” — or subordinate-bias — liability. Its core insight is a causation principle: a decisionmaker’s lack of personal animus does not immunize the employer when a biased subordinate’s intentional act is a proximate cause of the adverse action. The decision reframes the inquiry from “who made the final call” to “whose animus set the wheels in motion,” and it treats the formal decisionmaker’s judgment as one proximate cause among several rather than a chain-breaking superseding cause. Although the case arose under USERRA, the Court grounded its reasoning in the shared “motivating factor” language of Title VII, and lower courts have applied Staub across the federal antidiscrimination statutes.

For California practitioners, the most important payoffs are two. First, Staub forecloses the reflexive “independent investigation” defense: an employer’s later review does not preclude liability where the review credits the biased actor’s report without independently determining that the action was justified apart from the tainted recommendation. That is precisely the analysis the Ninth Circuit applied in Lui v. DeJoy (9th Cir. 2025) 129 F.4th 770, where a paper-only review that relied on the reports of the very people alleged to be biased created a triable issue on whether the decision was “actually independent.” Second, California courts recognize subordinate-bias liability under FEHA, so Staub’s causation framework supplies persuasive authority for attributing a biased supervisor’s animus to a California employer even when the ultimate decisionmaker is blameless.

Key quotes

“[I]f a supervisor performs an act motivated by antimilitary animus that is intended by the supervisor to cause an adverse employment action, and if that act is a proximate cause of the ultimate employment action, then the employer is liable under USERRA.” (Staub, supra, 562 U.S. at p. 422.)

“[I]t is axiomatic under tort law that the exercise of judgment by the decisionmaker does not prevent the earlier agent’s action (and hence the earlier agent’s discriminatory animus) from being the proximate cause of the harm.” (Staub, supra, 562 U.S. at p. 419.)

“We are aware of no principle in tort or agency law under which an employer’s mere conduct of an independent investigation has a claim-preclusive effect.” (Staub, supra, 562 U.S. at p. 421.)

Read the full opinion (Justia) →

Practice pointer

Open questions

Staub deliberately left several matters unresolved. In footnote 4, the Court “express[ed] no view as to whether the employer would be liable if a co-worker, rather than a supervisor, committed a discriminatory act that influenced the ultimate employment decision,” and separately reserved “whether Proctor would have an affirmative defense” because Staub used the grievance process. (Staub, supra, 562 U.S. at p. 422, fn. 4.) The Court also declined to “decide what the background rule of agency law may be” regarding aggregating one agent’s animus with another’s act, resting instead on the statutory “motivating factor” text. (Id. at p. 418.) It expressly reserved, in footnote 2, the tort question of a defendant who intends one adverse action but a different one results, noting the record showed the supervisors “intended … Staub’s termination.” (Id. at p. 419, fn. 2.) And it remanded the harmless-error/new-trial question to the Seventh Circuit “in the first instance” — which, on remand, ordered a new trial. (Id. at p. 423; see 421 Fed.Appx. 647 (7th Cir. 2011).) For California, the open question is one of state law the decision does not reach: the precise contours of subordinate-bias liability under FEHA, including how the employer’s burden to show an untainted, independent basis operates on summary judgment.