Norman Lewis at Washington State University began his scientific career as a natural product chemist. But his interests soon turned toward the biochemistry of plants. These days, Lewis is focused on generating transgenic trees that are designed to make high-value products needed in the flavor and fragrance industries. The American Society for Biochemistry and Molecular Biology’s science writer, Rajendrani Mukhopadhyay, spoke with Lewis about his work. The interview has been edited for length and clarity.