John B. Watson

John Broadus Watson he was born on January 9, 1878 an died September 25, 1958 he was an American psychologist who established the psychological school of behaviorism, after doing research on animal behavior. He also made the controversial "Little Albert" experiment. Later he went on from psychology to become a popular author on child-rearing, and an acclaimed contributor to the advertising industry. He was well recognize around the whole world.

http://en.wikipedia.org/wiki/John_B._Watson

Ivan Pavlov

Ivan Petrovich Pavlov Russian,born on September 14, 1849 died on February 27, 1936 was a Russian, and later Soviet, physiologist, psychologist, and physician. He was awarded the Nobel Prize in Physiology or Medicine in 1904 for research pertaining to the digestive system. Pavlov is widely known for first describing the phenomenon of classical conditioning.
Ivan Pavlov was born in Ryazan, Russia. He began his higher education as a student at the Ryazan Ecclesiastical Seminary, but thn dropped out and enrolled in the University of Saint Petersburg to study the natural sciences and become a physiologist. He received his doctorate in 1879.
In the 1890s, Pavlov was investigating the gastric function of dogs by externalizing a salivary gland so he could collect, measure, and analyze the spitt and what response it had to food under different conditions. He noticed that the dogs tended to salivate before food was actually delivered to their mouths, and set out to investigate this "psychic secretion", as he called it.

http://en.wikipedia.org/wiki/Ivan_Pavlov