“Think of Others: What is Your Radius of Concern?” invites readers to consider how empathy and responsibility influence our personal lives and communities. Donald F. Gerson introduces the concept of a “radius of concern,” which measures how far one’s care extends beyond immediate family and close friends to community, country, and the Earth. He urges readers to reflect on how expanding their radius of concern can create stronger, more compassionate, and resilient communities that benefit all members of society. Through vivid stories, Gerson leads readers on a path from empathic concern to effective altruistic action, improving the lives of people from local communities to distant lands. Drawing on decades of leadership in social settings, laboratories, and manufacturing facilities, the author demonstrates that caring for others is a natural and essential part of human well-being. The book explores how simple acts of kindness foster trust, alleviate loneliness, and enhance daily life. In particular, the enormous efforts behind the discovery, manufacturing, approvals, and distribution of new medicines depend first on an empathic concern for those who may become ill, and then the transformation of that feeling into tangible altruistic outcomes that take years and enormous resources to bring to fruition—in a way that only happens by working together. The net result provides both physical health and well-being to all of us, everywhere. Gerson also emphasizes the importance of helping others expand their own sphere of concern. Through mentorship, community service, and sharing knowledge, we can promote empathy and responsibility among those around us. “Think of Others” serves as both a reflection and a practical guide. It calls for us to build the meaning and substance of concerned care outward from ourselves to all of humanity. It encourages each of us to do whatever we can for others, no matter how distant they may be.