You’ve got to repeat your message frequently, have it come from a trusted source, and have a message that squashes the concern of the person that you are trying to convince.
Eugenie Scott thinks that scientists can be excellent communicators. As the chair of the Advisory Council for the National Center for Science Communication, Scott is dedicated to providing information and resources for schools, parents, and concerned citizens working to keep evolution and climate science in public school science education. She has been both a researcher and an activist in the creationism/evolution controversy for over 25 years, and can address many components of this controversy, including educational, legal, scientific, religious, and social issues.
Scott is the author of Evolution vs Creationism. She earned her Ph.D. at the University of Missouri in Physical Anthropology.