Why did he agree to work with the book's author in the first place?

What has it got to do with you or the author?

The following year he had his first meeting with the novel's author.

However, I am in almost complete agreement with the author.

Working directly with the author of a program often has added benefits.

What had been her contact with the author of those letters?

I agree with the author that things do seem to be getting worse.

In most cases they had no contact with the actual author at all.

The company has worked with several authors in the field of Indian art and culture.

I have to agree with the author totally on this one.