She's also a professor at Oregon State University - that's not where she does her screaming, though. Her first book, a collection of essays called "Let Me Clear My Throat," explores in depth the power of the human voice. How it resonates with us as a species and the myriad ways we use it.
Now she's out with her second book, "Animals Strike Curious Poses." It tracks our human fascination with animals over the past 39,000 years.