Toxic Workers

A Harvard Business School working paper by Michael G. Housman and Dylan B. Minor shifts attention away from the relentless pursuit of top performers and toward a less examined—but far more damaging—problem in organizations: toxic workers.

Prior research has largely focused on identifying, hiring, and developing high performers. By contrast, this paper asks a different question: how should organizations manage employees whose behavior actively harms performance, people, and property? In extreme cases, these workers generate not only productivity losses, but also substantial regulatory, legal, and reputational costs.

To address this gap, the authors analyze a novel dataset of more than 50,000 workers across 11 firms. The data allow them to examine the characteristics, workplace circumstances, and behaviors that increase the likelihood an employee will engage in serious misconduct—what the authors define as toxic behavior.

The study explores three core questions. First, what individual traits and situational factors predict toxic behavior? Second, how does toxicity relate to worker productivity—are toxic workers simply poor performers, or something more complex? Third, what ripple effects do toxic workers have on the people around them?

One of the paper’s most counterintuitive findings is that toxic workers are not necessarily low performers. In fact, many toxic employees are relatively productive, which helps explain why they are often tolerated by managers and allowed to persist in organizations despite their harmful behavior.

However, the damage caused by toxic workers extends far beyond their individual output. Toxicity creates negative spillovers that affect coworkers, increasing misconduct, disengagement, and turnover among peers. These ripple effects substantially magnify the true cost of employing a toxic worker.

When these costs are quantified, the authors find a striking result: avoiding the hire of a toxic worker—or converting a toxic worker into an average one—improves organizational performance by far more than replacing an average worker with a so-called superstar.

The implication is clear. While top talent can add value, preventing harm delivers significantly greater returns. Organizations that focus exclusively on maximizing individual productivity while ignoring behavioral risk may be making a costly mistake.

The paper concludes that managing toxicity should be a central component of talent strategy. Screening, early detection, and intervention are not merely cultural priorities—they are among the most financially impactful decisions an organization can make.