What has the author Robert Ian Musker written?

There is no author named Robert Ian Musker. It's possible you've misremembered the name, or there's a typo.

Perhaps you're thinking of:

* Ron Musker: A screenwriter and director, known for his work on Disney animated films like "The Little Mermaid", "Aladdin", and "Moana".

* Ian McBryde: A Scottish author who writes historical fiction and crime novels.

Please double-check the name and provide any additional information you have about the author you're looking for, and I'll do my best to help.