Information science and technology are critical to the modern practice of public health. Yet today's public health professionals generally have no formal training in public health informatics--the application of information science and technology to public health practice and research. Responding to this need, the U.S. Centers for Disease Control and Prevention (CDC) recently developed, tested, and delivered a new training course in public health informatics. The course was designed for experienced public health program managers and included sessions on general informatics principles and concepts; key information systems issues and information technologies; and management issues as they relate to information technology projects. This course has been enthusiastically received both at the state and federal levels. We plan to develop an abbreviated version for health officers, administrators, and other public health executives.