The Calgary Zoo is home to a team of biologists who have earned international recognition as North America's leaders in the science of species recovery and reintroduction. The science journal "Nature" rates the Calgary Zoo as one of the top five zoos in the world for conservation research, alongside New York, San Diego, Frankfurt, and London. In June 2012, the head of the Calgary Zoo's Centre for Conservation Research, Dr. Axel Moehrenschlager, was awarded the Canadian Wildlife Federation's Roland Michener Conservation Award which recognizes individuals who have shown a commitment to "promote, enhance, and further the conservation of Canada's natural resources". Dr. Moehrenschlager is chair of the Reintroduction Specialist Group within the International Union for the Conservation of Nature, the world's largest conservation network. He is the first North American to hold this position.