Dr. Sidney Holt was a British biologist whose specialty, actually his passion was, saving large whales. He is probably best known for his conservation work with the International Whaling Commission once he realized that the current whaling quota structure was driving whale populations toward extinction.  Focusing his attention and his considerable mathematical prowess to protect and conserve large whale species, Dr. Holt provided scientific support to numerous non-governmental organizations that were working to stem the tide of whale kills and forcing whaling nations to only hunt in their own economic zones.  He used his scientific, communication, and diplomatic skills to turn the IWC from pro-hunting to a conservation body, a process that took decades of dedication.