Glen Cooper, MA, has worked as a psychotherapist with individuals and families in both agency and private practice settings since the 1970s. He has extensive training in family systems, object relations, attachment theory, and infant mental health assessment. Mr. Cooper also works as a treatment foster parent and long-time Head Start consultant.

Since 1985, he has had a shared clinical practice in Spokane, Washington, with Kent Hoffman and Bert Powell. Much of their work has focused on the creation and dissemination of the Circle of Security, for which each has received the Washington Governor’s Award for Innovation in Child Abuse Prevention and the New York Attachment Consortium's Bowlby–Ainsworth Award, among other honors.

They are coauthors of The Circle of Security Intervention (for mental health professionals) and Raising a Secure Child: How Circle of Security Parenting Can Help You Nurture Your Child's Attachment, Emotional Resilience, and Freedom to Explore (for parents).

Kent Hoffman, RelD, has been a psychotherapist since 1972. Certified in psychoanalytic psychotherapy by The Masterson Institute in New York City, he has worked with prison and homeless populations as well as adults seeking psychoanalytic psychotherapy. His primary focus since the 1990s has been working with and designing treatment interventions for street-dependent teens with young children.

The underlying theme of his life work can be found in a TEDx talk titled "Infinite Worth." Since 1985, Dr. Hoffman has had a shared clinical practice in Spokane, Washington, with Glen Cooper and Bert Powell.

Together, they have created and disseminated the Circle of Security, for which each has received the Washington Governor’s Award for Innovation in Child Abuse Prevention and the New York Attachment Consortium's Bowlby–Ainsworth Award, among other honors.

They are coauthors of The Circle of Security Intervention (for mental health professionals) and Raising a Secure Child: How Circle of Security Parenting Can Help You Nurture Your Child's Attachment, Emotional Resilience, and Freedom to Explore (for parents).

Bert Powell, MA, Glen Cooper, MA, and Kent Hoffman, RelD, have devoted their Spokane, Washington, clinical practice of more than 30 years to translating complex clinical insights and developmental research into straightforward and accessible protocols for use with families.

During the last two decades they have focused specifically on the creation and dissemination of the Circle of Security (COS), for which each has received the Washington Governor's Award for Innovation in Prevention, among other honors.