In 1958, they founded Whitby School—the first Montessori school to open in the United States since the initial flurry of interest in the early 20th century.

In 1961, Time magazine featured Rambusch, Whitby School, and the American Montessori revival in its May 12 issue.

Professor John J. McDermott, a colleague and friend, agreed, arguing that the popular idea of the universality of children displayed a basic naiveté about the interrelationships between a culture and the child's development of consciousness.

McDermott also stressed the need to move Montessori into the public sector so that it would be available to all children, regardless of their circumstances—a conviction that remains a vital underpinning of the organization, along with a belief in the need for adaptability.

The multi-media collection reflects the activities of the AMS going back to its earliest days, and also provides historical information about Montessori education.

"[9] Therefore, in the United States and around the world, the term can be used freely without giving any guarantee of how closely, if at all, a program applies Montessori's work.