When thinking about how to develop in our careers, most of us tend to focus on promotions, projects, courses, certifications. We seek out expanded roles, more senior titles, extra money. We overlook one very key piece of the learning puzzle: proactively surrounding ourselves with people who will push us to succeed in unexpected ways and, in so doing, build genuinely rich, purposeful lives of growth, excellence, and impact. See this brilliant article from HBR to find out more.