He studied Humanities and History in Tel Aviv University, and later on he studied Law. After his university studies, he was appointed advisor to the Israeli Minister of Immigration Absorption and then became the spokesman of the Ministry.
In 1984, he began his career as a journalist and essayist and published the book "Political Punch" which deals in a critical way with politics and society in Israel. He worked as a lawyer and was a partner in a law firm. Since 2003 he is the opinion-editor of the daily newspaper Maariv and also published many articles and essays in other journals.
In recent years he researched and published "industry of lies " about publications against the State of Israel and its Jewish character, which he considers false. In this framework, he published a series of research articles about the Israeli-Arab conflict in which he examined the issues of genocide, refugees, Palestinian and Arab capital, the status of Israeli Arabs, Multiculturalism, and the status of women. All these articles included a comparative study about each topic.
According to Yemini, "the modern Anti-Zionism is a politically correct Antisemitism ". He argued that the same way Jews were demonized, Israel is demonized, the same way the right of Jews to exist was denied, the right for Self-determination is denied from Israel, the same way Jews were presented as a menace to the world, Israel is presented as a menace to the world. In his comparative studies, he presents the huge gap between the myths against Israel, from one hand, and the real facts, from the other hand.
According to Wikipedia, "He supports the Two-state solution and opposes settlements in the "West Bank ". He argues that the extreme right and the extreme left lead to the same goal of One-state solution. His articles concerning the Israeli-Arab conflict and his comparative studies led him to become the most translated Israeli journalist and a widely invited speaker about criticism of Israel ".