After retiring from professional tennis in August 2011, Serbian player Dušan Vemić joined Djokovic's team as assistant coach and hitting partner for Novak. The collaboration ended before the 2013 US Open. Six-time major champion and former world No. 1 Boris Becker, who had mostly worked as television pundit for BBC Sport and Sky Sports since retiring from playing in 1999, was announced as Djokovic's new head coach in December 2013. According to Djokovic, the Becker appointment was done with input from the player's existing head coach Marián Vajda who reportedly wanted to spend more time with his family and was looking to have his coaching workload somewhat reduced. For Becker, in addition to working alongside Vajda, the job entailed special emphasis on Grand Slam tournaments as Djokovic felt he missed out on winning a couple of majors over the previous two seasons due to a lack of mental edge in the final stages of those tournaments. Becker's first tournament coaching Djokovic was the 2014 Australian Open. On 5 May 2017, Djokovic confirmed that he had come to a mutual agreement to terminate his coaching relationship with Vajda, as well as Phil-Gritsch and Amanović. In a statement on his website, Djokovic cited the reasons for the personnel shakeup: "Novak and the team members decided to part ways after a detailed analysis of the game, achieved results in the previous period, and also after discussing private plans of each team member. Despite the fantastic cooperation so far, Djokovic felt he needed to make a change, and to introduce new energy in order to raise his level of play." On 30 June 2019, Djokovic confirmed that he added former world No. 2 and Wimbledon champion Goran Ivanišević to his coaching team. In 2007, Djokovic founded the Novak Djokovic Foundation. The organization's mission is to help children from disadvantaged communities to grow up and develop in stimulating and safe environments. The foundation partnered with the World Bank in August 2015 to promote early childhood education in Serbia. His foundation has built 43 schools and supported almost 20,800 children and a thousand families. He participated in charity matches with the aim of raising funds for the reconstruction of the Avala Tower, as well as to aid victims of the 2010 Haiti earthquake and 2010–11 Queensland floods. Djokovic was selected as the 2012 Arthur Ashe Humanitarian of the Year, for his contributions through the foundation, his role as a UNICEF national ambassador and other charitable projects.