John Campbell John Campbell is Executive Director of Growth Coaching International Pty Ltd., an Australian-based consulting organization that provides coaching and coaching services to school leaders and teachers across Australia and in the UK, the Middle East, and the Asia/Pacific region. Christian van Nieuwerburgh Professor Christian van Nieuwerburgh is a well-respected executive coach, an internationally recognized academic and a sought-after consultant. Christian is Professor of Coaching and Positive Psychology at the University of East London (UK). Regarded as an international authority in the field, he regularly speaks at conferences, facilitates training, and consults in the UK, Europe, Australia, and the Middle East. Together they are the authors of The Leader’s Guide to Coaching in Schools, published by Corwin.