Konrad Lorenz
Konrad Zacharias Lorenz was an Austrian zoologist, ethologist, and ornithologist. He shared the 1973 Nobel Prize in Physiology or Medicine with Nikolaas Tinbergen and Karl von Frisch. He is often regarded as one of the founders of modern ethology, developing an approach that began with an earlier generation, including his teacher Oskar Heinroth.
Lorenz is recognized as one of the founding fathers of the field of ethology, the study of animal behavior. He is best known for his discovery of the principle of attachment, or imprinting, through which in some species a bond is formed between a new born animal and its caregiver. This principle had been discovered by Douglas Spalding in the 19th century, and Lorenzs mentor Oskar Heinroth had also worked on the topic, but Lorenzs description of Prgung, imprinting, in nidifugous birds such as greylag geese in his 1935 book Der Kumpan in der Umwelt des Vogels became the foundational description of the phenomenon.
Source: Wikipedia