Patricia Simmons appeals from the district court’s grant of summary judgment in favor of her former employer, Sykes Enterprises, on her claim of discrimination in violation of the Age Discrimination in Employment Act of 1967 (“ADEA”), 29 U.S.C. § 621 et seq. The district court concluded Ms. Simmons had failed to establish that Sykes’ reason for terminating her employment was prеtextual. For the following reasons, we AFFIRM.
BACKGROUND
Ms. Simmons began working for Sykes in 1997, first as a phone technician then later as a technician/assistant within the Human Resources (“HR”) Department at Sykes’ Sterling, Colorado office. By all reports, Ms. Simmons was a good employee during the ten years she was employed.
Ms. Simmons alleges her work environment grew hostile in June 2007 upon the return of Persephone James as the Sterling office’s site director. Shortly after returning to the Sterling office, Ms. James allegedly told Ms. Simmons in an “almost vicious” manner she thought Ms. Simmons had already retired. (Simmons Dep. 170:7-11, Aug. 7, 2008, Appellant’s App. at 128.) Ms. James also allegedly told Ms. Simmons at an office party: “You better slow down because at your age you’re going to have a heart attack if you keep this up.” (Id. 173:7-9.) Ms. Simmons also alleges Amanda Owen, Sykes’ Sterling HR *946 supervisor, made hostile comments about her to other co-workers. Specifically, Ms. Owen allegedly asked another emplоyee whether Ms. Simmons repeated herself and stated “now that Pat is getting older she seems to forget a lot and is always repeating herself.” (Gaddis Aff. ¶ 2, Aug. 14, 2008, Appellant’s App. at 321.) Ms. Simmons never complained to management about either Ms. James or Ms. Owen.
In early August 2007, an aggrieved employee complained tо Ms. Owen that somebody within the company had improperly disclosed the employee’s confidential medical information. Ms. Owen notified Jeff Bieker, Sykes’ regional HR Manager, and Mr. Bieker instructed Ms. Owen to begin interviewing those mentioned in the complaint. Shortly thereafter, Janice DiRose, Sykes’ corporatе employment counsel and senior director of HR compliance, was notified of the complaint. Ms. DiRose instructed Ms. James to interview and obtain written statements from those involved. Ms. James, Ms. Owen, and Mr. Bieker all participated in the investigation. They determined from initial interviews and statements that Ms. Simmons had disclоsed the confidential information to another HR associate, Sharon Gaddis, who in turn disclosed it to others outside of their department.
On August 2, Ms. Gaddis answered questions and signed a statement, typed by Ms. James, implicating Ms. Simmons as the source of the confidential information. On August 7, Ms. Gaddis supplemented her statement with information suggesting the confidential information had also been disclosed in a manner independent from Ms. Simmons’ conduct. Although Ms. Gaddis has since disavowed her statements, at no time during the investigation did she recant her allegations despite having the opportunity to do so.
Ms. James and Mr. Bieker twice met with Ms. Simmons to question her about thе disclosure. Prior to answering their questions, Ms. Simmons read and signed a Notice of Investigation (“NOI”). The NOI informed her she would not be retaliated against for participating in the investigation but she would be subject to discipline or termination for disclosing confidential information, providing false or misleading information, or sharing any infоrmation regarding the investigation. During both interviews, Ms. Simmons denied any wrongdoing.
After Ms. James, Ms. Owen, and Mr. Bieker completed their interviews, Ms. Di-Rose reviewed the collected statements and personally interviewed Ms. Gaddis and Ms. Simmons. Ms. Simmons again denied having disclosed the confidential information. However, Ms. DiRose believed that, оver the course of the investigation, Ms. Simmons gave inconsistent answers regarding her knowledge of the confidential information and discussed other employees’ confidential medical information. During a conference call between Ms. James, Ms. Owen, Mr. Bieker, and Ms. DiRose, Mses. James and Owen recommended Ms. Simmons be terminated. 1 Ms. DiRose then recommended to Jenna Nelson, Sykes’ senior vice president of HR, that Ms. Simmons be terminated, and Ms. Nelson authorized the termination.
Sykes fired both Ms. Simmons, who was sixty-two, and Ms. Gaddis, who was twenty-three. After her termination, Ms. Simmons filed a complaint with the Equal Employment Opportunity Commission. *947 After receiving a Dismissаl and Notice of Rights, she filed this lawsuit in district court. The court granted summary judgment in favor of Sykes, concluding Ms. Simmons did not establish any dispute of material fact that Sykes’ stated reasons for her termination were pretext for age discrimination. This appeal followed.
DISCUSSION
We review the grant of summary judgment de novo, applying thе same standards as the district court.
See Hinds v. Sprint/United Mgmt. Co.,
Under the ADEA, it is “unlawful for an employer ... to fail or refuse to hire or to discharge any individual or otherwise discriminate against any individual with respect to his compensation, terms, conditions, or privileges of employment, because of such individual’s age.” 29 U.S.C. § 623(a). “[T]he ordinary meaning of the ADEA’s requirement that an employer toоk adverse action ‘because of age is that age was the ‘reason’ that the employer decided to act.”
Gross v. FBL Fin. Servs., Inc.,
557 U.S.-,
Ms. Simmons has not challenged the district court’s holding that there is no direct evidence of discrimination, so we evaluate her ADEA claim using the three-step framework outlined in
McDonnell Douglas Corp. v. Green,
Pretext
Our relevant inquiry for determining pretext is “whether the employer’s stated reasons were held in good faith at the time of the discharge, even if they later prove to be untrue, or whether plaintiff can show that the employer’s explanation was so weаk, implausible, inconsistent
*948
or incoherent that a reasonable fact finder could conclude that it was not an honestly held belief but rather was subterfuge for discrimination.”
Young v. Dillon Cos., Inc.,
Any argument by Ms. Simmons for pretext based on whether she actually disclosed the confidential information fails to address our inquiry of whether Sykes honestly relied in good faith upon the reported inconsistencies both in Ms. Simmons’ statements and between her statements and the statements of others. “Evidence that the employer should not have mаde the termination decision—for example, that the employer was mistaken or used poor business judgment—is not sufficient to show that the employer’s explanation is unworthy of credibility.”
Swackhammer v. Sprint/United Mgmt. Co.,
Turning then to the basis for Sykes’ decision, it claims it relied on perceived inconsistencies in Ms. Simmons’ statements, including her initial statement that she was unsure if others knew the confidential information even though she later told the investigators other people were aware of the information and her claims that she did not know certain details of confidential information despite mentioning those details during the course of her interviews and statemеnts. Sykes also claims to have relied on Ms. Simmons’ voluntary disclosure of unrelated confidential medical information in a written statement submitted to the investigators as evidence that she could not be trusted with confidential information.
Sykes has consistently relied upon these concerns as its justification for believing Ms. Gаddis’ statements over those of Ms. Simmons and concluding Ms. Simmons disclosed the confidential information. Here, “[o]ur role is ... not to act as a ‘super personnel department’ that second guesses employers’ business judgments.”
Simms v. Oklahoma ex rel. Dep’t of Mental Health and Substance Abuse Servs.,
*949 Subordinate Bias
Our inquiry is not limited, however, to evaluating whether Sykes’ justification for terminating Ms. Simmons was, in the eyes of the final decision-makers, honestly held in good faith. We must also address whether Mses. James and Owen harbored discriminatory animus toward Ms. Simmons and, through their biased influence on the final decision, caused Ms. Simmons’ termination.
The Supreme Court recently affirmed the theory of subordinate bias — or “cat’s paw”
3
— liability in
Staub v. Proctor Hospital,
562 U.S. -,
We must first consider whether the holding in
Staub
applies to discrimination cases brought under the ADEA. Unlike Title VII and the USERRA, “the ADEA’s text does not provide that a plaintiff may establish discrimination by showing that age was simply a motivating factor,” the operative phrase relied upon in
Staub. Gross,
Although we apply the subordinate bias doctrine to age discrimination cases, the ADEA requires more than what must ordinarily be proven under an analogous Title VII or USERRA action. If we were to apply
Staub
directly to an age-discrimination case, the plaintiff would then only need to prove her supervisor’s animus was somehow related to the termination and not that the animus was necessary to bring about the termination.
Compare Staub,
To illustrate, a supervisor’s animus might be a “but-for” cause of termination where, for example, the biased supervisor falsely reports the employee violated the company’s policies, which in turn leads to an investigation supported by the same supervisor and eventual termination. Or the biased supervisor may write a series of unfavorable periodic reviews which, when brought to the attention of the final decision-makеr, serve as the basis for disciplinary action against the employee. But where a violation of company policy was reported through channels independent from the biased supervisor, or the undisputed evidence in the record supports the employer’s assertion that it fired the employеe for its own unbiased reasons that were sufficient in themselves to justify termination, the plaintiffs age may very well have been in play — and could even bear some direct relationship to the termination if, for instance, the biased supervisor participated in the investigation or recommended termination — but age was not a determinative cause of the employer’s final decision.
Here, assuming without deciding that Mses. James and Owen were motivated by ageist animus and intended to have Ms. Simmons’ employment terminated, we must still determine whether Ms. Simmons’ age was a “but-for” cause of her termination by asking whether Sykes would have fired Ms. Simmоns but for Mses. James and Owen’s alleged bias. It is undisputed that neither Ms. James nor Ms. Owen caused the investigation to begin. Rather, Mr. Bieker and Ms. DiRose acted in response to a complaint initiated by an aggrieved, unbiased employee. Mr. Bieker ordered the first interview, and Ms. DiRose ordered the full investigation. Ms. DiRose received input from individuals other than Mses. James and Owen and personally interviewed both Ms. Simmons and Ms. Gaddis before deciding to recommend termination to Ms. Nelson. Mr. Bieker, against whom there is no allegation of discriminatory bias, similarly concluded Ms. Simmons should be terminated. Sykes also terminated Ms. Gaddis’ employment for similar violations of company policy despite an absence of discriminatory animus.
These undisputed facts permit only the inference that, absent the alleged discriminatory bias, Sykes would still have fired Ms. Simmons because, from Sykes’ perspective, she violated company policy and could not be trusted with confidеntial information. Thus, a reasonable jury could not find Ms. Simmons was terminated because of her age.
CONCLUSION
For the foregoing reasons, we AFFIRM the district court’s order granting summary judgment.
Notes
. It is unclear whether Mr. Bieker recommended termination during the conference call. However, he did conclude that Ms. Simmons should be terminated and discussed his conclusion with Ms. James. (Bieker Dep. 40:19-24, Aug. 8, 2008, Appellant’s App. at 225.)
. Ms. Simmons argues for the first time in her reply brief that Sykes authorized Ms. Gaddis to have access to the confidential information and thus it would be impossible for Ms. Simmons to disclose anything to Ms. Gaddis about which Ms. Gaddis did not already have the right to know. This argument comes too late. "This court does not ordinarily review issues raised for the first time in a reply
*949
brief.”
Stump v. Gates,
. The term "cat's paw” entered the employment discrimination lexicon in
Shager v. Upjohn Co.,
