Who is John Christian from The Hidden Dimension and what is their importance?

John Christian is an ethologist and medical pathologist who conducted histological research on the Sika deer of James Island. Through autopsies performed on deer who died after overcrowding, during die-off, and after subsequent population stabilization, he identified important internal physiological alterations which resulted in severe metabolic disturbances and shock. The return to normalcy of metabolism after population stabilization demonstrated that overcrowding of animals has disastrous physical consequences.