According to Wikipedia,
Robert William Sears, known as Dr. Bob, is an American pediatrician from Capistrano Beach, California, noted for his unorthodox and dangerous views on childhood vaccination. His book, The Vaccine Book: Making the Right Decision for your Child , proposes two alternative vaccination schedules that depart from accepted medical recommendations. His proposals have enjoyed celebrity endorsement, but are not supported by medical evidence and have contributed to dangerous under-vaccination in the national child population. While he denies being anti-vaccine, Sears is characterized as anti-vaccine and as a vaccine delayer.