Most senior leaders don't derail because they lack intelligence or drive. They derail because they stopped learning — and didn't notice until the damage was done. In this article, executive coach Jan Salomons explores the neuroscience behind why behavioral change is so hard, the five warning signs that a leader's learning agility is eroding, and what the research really says about what separates leaders who keep growing from those who quietly plateau. Drawing on decades of evidence from Korn...