Gregor Mendel was an Austrian scientist and monk who is known as the father of modern genetics. He conducted experiments with PEA plants in the mid-1800s, which led to the discovery of the laws of inheritance. His work laid the foundation for the study of genetics and has had a lasting impact on the field. The term 'Gregor Mendel Subject' refers to the study of genetics, which was pioneered by Mendel's experiments with PEA plants.