Dr. Henry Cloud is an American psychologist and author widely regarded as one of the most trusted voices in the fields of personal development and relational health. He rose to international acclaim with books including Boundaries, co-authored with Dr. John Townsend, and Necessary Endings, works that continue to be read for their practical guidance on setting healthy limits and navigating difficult relationships and decisions. A clinical psychologist by training, he draws on decades of experience in both clinical practice and leadership consulting to explore how emotional health, boundaries, and self-awareness shape personal and professional success. His Boundaries series has sold millions of copies and expanded into resources for marriage, parenting, and the workplace, helping readers apply the same core principles across different areas of life. Known for his clear, practical approach to psychology and personal growth, Cloud's work continues to shape modern self-help writing and inspire readers across the world.