William Cecil Campbell, an Irish-American biologist and parasitologist born in 1930, is renowned for his discoveries in the field of therapies against parasitic infections. During his career at the Merck Institute for Therapeutic Research, he led a team that discovered and developed Avermectin and its derivative, Ivermectin. These compounds have proven to be extraordinarily effective in treating devastating parasitic diseases such as onchocerciasis (river blindness) and lymphatic filariasis, which affect millions of people in developing countries. His research has had a revolutionary impact on global public health, leading to large-scale eradication programs. For this fundamental contribution, in 2015 he was awarded the Nobel Prize in Physiology or Medicine, shared with Japan's Satoshi Ōmura and China's Tu Youyou. After retiring from Merck, Campbell became a Research Fellow at Drew University, continuing to contribute to academia.