When a young Jane Goodall entered the forests of Tanzania to study wild chimpanzees, neither she nor those supporting her work imagined the influence she would have. Today, Goodall—Ph.D., DBE, founder of the Jane Goodall Institute, and United Nations Messenger of Peace—is recognized not only as a...

Danielle Tepper had always loved dolphins. When she went on vacation to Hawai'i, she knew she had to see them firsthand. Tepper—now a senior editor at the Humane Society of the United States—wanted to do it ethically, so she avoided captive dolphin attractions. Instead, she booked an excursion to...