As a journalist he has interviewed people such as Jane Goodall, Chuck Yeager, Edward Teller, Paul Tibbets and Armin Lehmann.

[4] Harrison has written books on science, skeptical and philosophical issues, beginning with 50 Reasons People Give for Believing in a God in 2008.

[12] Reviewed in the Spring 2019 issue of Skeptical Inquirer by Russ Dobler, who writes that At Least Know This is a primer for the layperson who wants to understand what we know, not necessarily how we know it.

Harrison brings his skills as a journalist as well as his degrees in history and anthropology to discuss weighty topics "spanning all of time and space".

It almost "feels a bit like an attempt at a twenty-first century version of Cosmos" yet, some "science purists who prioritize methodology over trivia" may not agree.