For more than a decade, Third Culture Kids has been the authority on "TCKs"-children of expatriates, missionaries, military personnel and others who live and work abroad. With a significant part of their developmental years spent outside of their passport country, TCKs create their own, unique "third" cultures. Authors Pollock and Van Reken pioneered the TCK profile, which brought to light the emotional and psychological realities that come with the TCK journey, often resulting in feelings of rootlessness and grief but also in increased confidence and ability to interact with many cultures.