Teller is an international speaker for schools, women's groups, synagogue functions, learning seminars, fundraising dinners, and organizational meetings in North America, Central America, South America, Europe, Israel, and Australia. In his talks, he teaches Torah topics interwoven with inspiring stories about Gedolim and other Jewish heroes. Following the publication of his 2015 non-fiction book "Heroic Children: Untold Stories of the Unconquerable", he was invited to speak on the Holocaust and stories of child survivors to both Jewish and non-Jewish groups in the United States.