In your opinion, what is the number one key skill/trait of a good HR leader?

It depends on the level of the leader. I'm going to cheat a little here and start with some basic skills that are point of entry for all HR leaders including communication, EI, collaboration, and consulting. As someone moves from supervisor to manager, it's important to build managerial courage; from manager to Director - business acumen and the ability to understand data. From Director to VP or CHRO - strategy and influence with all the skills building through the progression. I know that different models on HR leadership focus on different competencies, so these are based on my own experience as both a customer of HR and an HR leader.

I agree with Melissa.  Emotional intelligence is an important skill needed!

emotional intelligence