An expert in my field
Hi friends, today I'm going to talk about an expert in my field: Hans Kelsen. He's a big austrian jurist, of jewish descent. He wrote "The Pure Theory of Law", one of the most important works in legal sciences.
Kelsen studied Law at the University of Vienna. He was part of the Constitucional court of Austria until rise of nazism. During second world war, he had to scape from Europe, arriving to Unitated States. There, he became teacher of Harvard University.
 His theory exclude any conception about natural law, rejecting any moral or religious influence over the legal science. This is a positivist system that looks at the law as a single science. So, this science has to be studied without any influence of the other sciences, with special emphasis in the norms and their structure. He thinks that exist a hierarchical system of norms with a foundational norm that he names "Grundnorm".
I like Hans Kelsen because I think that Law has to be studied as a single science. It's necessary consider other sciencies, but if' we look at the law as a unitary an hierarchical sytem, it's eassier found anwers to the many problems that appear in legal science.