Alfred Sommer is a prominent American ophthalmologist and epidemiologist at the Johns Hopkins Bloomberg School of Public Health. His research on vitamin A in the 1970s and 1980s revealed that dosing severely vitamin A deficient children with an inexpensive, large dose vitamin A capsule twice a year reduces child mortality by as much as 34 percent. Wikipedia*
On the C-SPAN Networks:
Alfred Sommer has two videos in the C-SPAN Video Library; the first appearance was a 1992 Forum as a Dean for the Johns Hopkins University School of Medicine. The year with the highest average number of views per program was 1998 with an average of 48 views per program.