Susan Close is the state Labor Party member for Port Adelaide in the South Australian Parliament. She previously served as South Australia’s minister for education and child development and oversaw the passage of a 2017 law banning unvaccinated children from enrolling in preschools and child care centers.

Roberto Burioni is a professor of microbiology and virology at San Raffaele University in Milan, Italy. He helps lead online campaigns to educate Italian families about vaccine science.

Josh Williams is an assistant professor of pediatrics at the University of Colorado School of Medicine. He researches how religion influences people’s views on vaccines.

Ryan Tipping is a Democratic representative in the Maine House of Representatives. He sponsored the 2019 legislation that ended nonmedical vaccine exemptions.

Brad Hoylman is a Democratic state senator in New York. He sponsored the 2019 legislation that eliminated nonmedical exemptions to school vaccine requirements. Arrange an interview through Avi Small.

Peter Hotez is dean of the National School of Tropical Medicine at the Baylor College of Medicine in Houston. He worked on research teams that developed vaccines for hookworm, schistosomiasis and SARS. Hotez is also the author of Vaccines Did Not Cause Rachel’s Autism: My Journey as a Vaccine Scientist, Pediatrician and Autism Dad.

Paul Harris is a Republican representative in the Washington House of Representatives. He sponsored the 2019 legislation ending the personal belief exemption to the state MMR vaccine requirement. Contact Kent Livingston to arrange an interview.

John Grabenstein is the associate director for scientific communications for the Immunization Action Coalition. He is the author of a 2013 review of religious teachings related to vaccines.

Sue Collins is a co-founder of the New Jersey Coalition for Vaccination Choice. She helped defeat the New Jersey Legislature’s effort to end religious exemptions to vaccine requirements. Arrange an interview through the coalition’s contact form.