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I'm a medical doctor and a biomedical scientist.

I trained initially as a physical chemist, and then, after becoming interested in biology, I went to medical school and learned how to be a physician. So, I'm a physician scientist.

I am a medical scientist, not a practical physician.

I say I'm an academic: a professor of psychiatry at Johns Hopkins. And I write.

As an undergraduate, I did maths and physics. That doesn't make me a scientist. So I try to read and understand and talk to scientists.

I'm a journalist and author. I make my living by finding things out and writing about them.

I absorb the science section of 'The New York Times.' You know, I have a degree: I'm an A.A.D. Almost a Doctor.

I did several interesting jobs, working in restaurants, I worked at a lab rat farm, feeding and watering all these rats. Then I got a full-time job as a technical writer for a large scientific research laboratory.

I write novels and other things.

I'm an author. And writers write books. And writing books is a full-time career.