What has the author Robert Schwartz written?

Robert Schwartz is a well-known author, but there are several authors with that name. To give you the most accurate answer, could you please clarify which Robert Schwartz you're referring to?

For example, are you thinking of:

* Robert Schwartz, the author of the "Your Soul's Plan" series: This Robert Schwartz focuses on spirituality and past lives.

* Robert Schwartz, a writer and illustrator: This Robert Schwartz has published books for children, particularly the "It's a Girl Thing" series.

* Other potential authors: There might be other Robert Schwartz authors with different areas of expertise.

Once you provide more information about the specific Robert Schwartz you're interested in, I can tell you about his books.