Paul R. Ehrlich, American biologist and author
Paul Ralph Ehrlich (born May 29, 1932) is an American biologist, best known for his warnings about the consequences of population growth and limited resources. He is the Bing Professor Emeritus of Population Studies of the Department of Biology of Stanford University and President of Stanford's Center for Conservation Biology.

Ehrlich became well known for the controversial 1968 book The Population Bomb which he co-authored with his wife Anne, in which they famously stated that "[i]n the 1970s hundreds of millions of people will starve to death in spite of any crash programs embarked upon now." Among the solutions suggested in that book was population control, including "various forms of coercion" such as eliminating "tax benefits for having additional children," to be used if voluntary methods were to fail. Ehrlich has been criticized for his opinions; for example, Ronald Bailey termed Ehrlich an "irrepressible doomster". Ehrlich has acknowledged that some of what he predicted has not occurred, but maintains that his predictions about disease and climate change were essentially correct and that human overpopulation is a major problem.