Raphael Lemkin

As a young Jewish law student who was deeply conscious of antisemitism and the persecution of Jews, Lemkin learned about the Ottoman genocide of the Armenian people during World War I and was deeply disturbed by the absence of international provisions to charge and punish those who were responsible for organizing and executing it. In his view, the suffering of the Jewish people was part of a larger pattern of like-minded atrocities occurring around the world and throughout history, such as the Holodomor.
In either 1943 or 1944, Lemkin coined the term "genocide" from two words: (, 'family, clan, tribe, race, stock, kin') and ''-cide'' (, 'killing'). It was included in the 1944 work of research ''Axis Rule in Occupied Europe'', wherein he documented the mass killings of the peoples that had been deemed "sub-human" () by the Nazi Party. The concept of genocide was defined by Lemkin to refer to the various extermination campaigns that Nazi Germany conducted in an attempt to wipe out entire ethnic groups, including the Holocaust, in which he personally lost 49 family members.
After World War II, Lemkin worked on the legal team of American jurist Robert H. Jackson, who served as the chief U.S. prosecutor among the Allied powers at the Nuremberg trials. The now-defined concept of genocide was non-existent in any form of international laws at the time, and this became one of the reasons for Lemkin's view that the trials did not serve complete justice on prosecuting Nazi atrocities against racial, ethnic, and religious groups. Lemkin committed the rest of his life to preventing the rise of "future Hitlers" by pushing for an appropriate international convention. On 9 December 1948, the United Nations approved the Genocide Convention, with many of its clauses based on Lemkin's proposals. Provided by Wikipedia
1