PHAB has been privileged to coordinate a special body of work related to assessing the potential for a national Disease Intervention Specialst (DIS) Certification Program. In keeping with PHAB’s tradition of publishing special editions of our e-newsletters when we have detailed information on a topic pertinent to public health practice and performance improvement, this e-newsletter is devoted solely to providing an update on DIS certification. In particular, the update highlights accomplishments from the second phase of the project, which was to assess the best model for DIS certification and undertake foundational activities for certification program development. We hope that you will enjoy reading about the important work that DIS do and the contribution that certification can make to their overall performance.