Conversation so far:
Was he a writer?
Carroll is the author of Becoming a Critical Thinker.
What was the book about?
a textbook for introductory logic and critical thinking courses.
Did he write anything else?
Carroll also wrote a children's version of the Skeptic's dictionary which was released online on July 22, 2011.
What was that about?
Similar to the website, it takes a skeptical stance, typically assuming that something is false until proven otherwise.

Question: What else did he write about?
Self-contained rewrite: What did Robert Todd Carroll write about, aside from "Becoming a Critical Thinker" and "Skeptic's Dictionary"?