This episode is the next in our oral history series, In Their Own Words. These pieces chronicle the stories of scientists who have made great contributions to their fields, particularly within the biological sciences. Each month, we will publish in the pages of BioScience, and on this podcast, the results of these conversations.  Today, we are joined by Peter Raven, president emeritus of the Missouri Botanical Garden, in St. Louis, Missouri. He is also a past president of AIBS. Note: Both the text and audio versions have been edited for clarity and length. Read this article in BioScience. Subscribe on iTunes. Subscribe on Stitcher. Catch up with us on Twitter.