Recognition of the importance of children’s early development from birth to kindergarten has increased significantly over the past two decades, and major public and private investment in early childhood has come along with it. With breakthrough research on how children develop and learn in the earliest years and decades of program delivery, the early childhood field knows more — and arguably has more opportunity — than ever before to support children’s healthy development and learning. And yet, despite so much positive effort, attention, and momentum, the field is not seeing the impact it is seeking or innovating fast enough to take advantage of the increased investments and focus on early childhood. Nationally, one in three children are not ready for kindergarten, and we know that the majority of children who start behind stay behind and never catch up. In the three years since the Lab’s inception, much has been accomplished and much work still lies ahead. To understand what impact has been made and where the Lab is taking the work next, it’s useful to review where we’ve been and what we’ve done. (author abstract)