Meet the Expert: David Brown, biologist and wildlife conservationist David Brown is a biologist, wildlife conservationist, and environmental educator. He has researched giraffe population genetics, and along with his colleagues discovered that many of the giraffe subspecies in the wild may be distinct species. David has written for National Geographic Kids, Highlights, and Mongabay.com. For Celebrating… Continue Reading Episode 55: How Do You Find a Hidden Giraffe?