Djerassi, a professor emeritus of chemistry at Stanford, was most famous for leading a research team in Mexico City that in 1951 developed norethindrone, a synthetic molecule that became a key component of the first birth control pill. "The thoughts behind these two public policy articles had convinced me that politics, rather than science, would play the dominant role in shaping the future of human birth control," he wrote. "Carl did many things in his life — he was a true Renaissance man and scholar," Philip Darney, a contraceptive scientist and director of the University of California, San Francisco's Bixby Center for Global Reproductive Health, told the Chronicle.