David H. Johnson, chairman of internal medicine at the University of Texas Southwestern Medical School and the William J. Harrington Visiting Professor at the Miller School of Medicine, will present “Medicine in the 21st Century: Challenges and Opportunities” on Wednesday, January 26 at 12 p.m. in the Rosenstiel Medical Science Building, third-floor auditorium. Lunch will not be provided. For more information, contact Merlyn Donatien at [email protected] or 305-243-9120.