Every one of us is surrounded by, and dependent on, other human beings—at work, at home, in daily life. Some of these people we choose to be with, while for some others, we have to accept their presence. All of them together influence us and shape our lives, and our careers, in a multitude of ways. This white paper explores the many ways that relationships shape our careers, for better (as tools for access, support, and sense-making) or for worse (as obstacles). It is based on a five-country study by the Center for Creative Leadership of men and women managers in wider Europe.