Tonja A. Koeppel

Tonja Koeppel was born and raised in Switzerland, where, after her advanced degree in chemistry, she worked as a science writer. When she came to this country, she taught chemistry at a college in New Jersey and got her Ph.D. in the history of science from the University of Pennsylvania. After her retirement she returned to her first avocation, writing. The Bell File is her third published novel. She now lives in Houston, Texas. She loves to travel every summer to Switzerland . In her spare time she plays the piano, walks and swims and entertains her big family with daughters, grandchildren and great-grandchildren.