Who is George Schaller from The Snow Leopard and what is their importance?

Dr. George Schaller is considered to be the world's preeminent field biologist and naturalist. Born in Germany, Schaller moved to the U.S. as an adult and settled in Missouri. Not long after, Schaller began his life-long series of journeys to remote lands to study the habits of various animals in the world, recording data heretofore unavailable to the scientific and modern communities.