The record showed that Defendants explained that the termination was based on the plaintiff's repeated failure to operate on patients having bouts of appendicitis in spite of management's directives to do so, and plaintiff failed to establish that defendants' explanation was unworthy of belief, as record showed that several of plaintiff's patients suffered because of plaintiff's failure to timely operate on their appendix. The fact that the plaintiff disputed the medical basis for management's directive did not create genuine factual dispute that could only be resolved by jury given existence of patients who suffered from plaintiff's delay or failure to operate at all. Plaintiff also failed to show that defendants treated similarly-situated surgeons more favorably after giving said surgeons specific instructions regarding course of patients' medical treatment.