Jarosław Aleksander Kaczyński was born on June 18, 1949, in Warsaw, Poland. He is a prominent Polish politician, co-founder of the Law and Justice (PiS) party, and served as prime minister of Poland from 2006 to 2007. He is the twin brother of Lech Kaczyński, the late president of Poland who died in the 2010 Smolensk air disaster. As of the latest widely reported information, he remains a leading figure within PiS and Polish politics.