From doping in athletics, allegations of match fixing in tennis and cricket, to corruption in football, and 'deflategate'. The World Anti-Doping Agency has traced institutionalized corruption to the very top of the Russian Athletics Federation, and worse still - the International Association of Athletics Federations allowed it to happen. New Zealander David Howman is the director general of the World Anti-Doping Agency. After 13 years he's stepping down in June 2016.