Axel Kicillof headed by Hernán Lorenzino. After that, on November 18, 2013, Kicillof officially became Minister of Economy. Kicillof was instrumental in the renationalization of YPF. President Cristina Fernández de Kirchner named Kicillof to the post of Secretary (or Deputy Minister) for Economic Policy and Development Planning in December 2011. He took academic leave to assume this post. In this position, Kicillof oversaw the controversial 2012 nationalization of YPF, the Argentine oil company then controlled by the Spanish energy firm Repsol. It was the largest expropriation in Argentina's history. He justified this action as part of a needed reversal of the Argentinian
Cristina Fernández de Kirchner confided in him that she had a bipolar disorder, while she was having a violent outburst. During the United States diplomatic cables leak it was revealed that Hillary Clinton questioned Kirchner's mental health and asked the US embassy whether she was receiving treatment or not; she later apologized to Kirchner for those leaks. Kirchner said in her book "La Presidenta" that it was all a misunderstanding; it is her sister who suffers from bipolar disorder. On 27 December 2011, presidential spokesman Alfredo Scoccimaro announced that Kirchner had been diagnosed with thyroid cancer on 22 December and that she would undergo