He also doubled up as a lawyer in private practice together with Kiraitu Murungi and Gibson Kamau Kuria, but when the latter two fell in trouble with the authorities during the "dark era" of Moi, he quit the firm he helped found and instead teamed up with George Oraro and Ambrose Rachier.
[2] Ringera was appointed as the first Director of KACC in August 2004, despite opposition from the Liberal Democratic Party, which was part of the NARC coalition government.
[5] In her 2009 book Our Turn To Eat, journalist Michela Wrong accused Ringera of delivering death threats against his then-colleague John Githongo in November 2005 and February 2006.
[5] Ringera has always answered his critics by stating that he did not have powers to prosecute those accused of corruption and resigned to save the KACC from the threat of dissolution.
On Thursday 12 November 2021, the Kenyan Sports, Culture and Heritage Cabinet Secretary Amina_Mohammed disbanded the Federation of Kenya Football (FKF) over corruption allegations.
A 15-member caretaker committee led by Aaron Ringera was appointed to hold office for six months leading to fresh elections.
[13] Later in the year following the 2022 General Elections, the National Treasury wrote to the Power Company seeking removal of the Board of Directors in a shakeup.