Interest in emotional intelligence has bloomed over the last few years. That it has become a standard concept in general and applied psychology, as well as in applied business settings, is indubitable. Is this popularity warranted? Casting a shadow over the concept of emotional intelligence are concerns about its meaningfulness and the construct and predictive validity of its various measures. The following series of letters explores various issues surrounding emotional intelligence and leadership including: whether emotional intelligence is theoretically needed for leadership, the types of emotional intelligence tests that may hold the most promise, methodological standards for testing whether emotional intelligence matters, evidence from the neuroscience literature on emotions and intelligence, and evidence regarding the links between leader emotional intelligence and follower outcomes.