Dr Widjojanto has been the Commissioner of the Indonesian Corruption Eradication Commission (KPK) since 2011.

He began his career by joining numerous Legal Aids Foundations (LBH) such as LBH Jakarta and LBH Jayapura. He is one of the founding fathers of the National Consortium for Legal Reform; the Commission for the Disappeared and Victims of Violence, and the Indonesian Corruption Watch. From 1995 to 2000, he was Board of Manager of the Indonesian Legal Aids Foundation. In 1993, he received Robert F Kennedy Human Right Awards for his consistence to defend Papua people rights.

He has significantly contributed to the development of various enforcement agencies in Indonesia, including the Selection Committee Member of Independent Prosecutorial Commission held by the Attorney General (2005), the Selection Committee Member of Anti-Corruption Ad Hoc Judges held by the Supreme Court (2005), the Selection Committee Member of Supreme Court Judge held by the Judicial Commission (2007), and the Attorney General Expert in the Attorney Reform Division (2006 - 2009). He has joined the Anti-Corruption Movement (Garansi), and was a coalition member of the Arrangement of Law on Constitutional Court and the lawyer / Legal Adviser Team of KPK.

Dr Widjojanto is a practitioner lawyer. After graduating from the Jayabaya University in Jakarta, he completed his first postgraduate program at the School of Oriental and African Studies in London University in 2001 and the second postgraduate program in Business Law at the Padjajaran University, Bandung, in 2005. In 2009, he obtained a doctoral degree in Law from the Padjajaran University. Dr Widjojanto also received Law and Human Rights training in the United States, the Netherlands and the United Kingdom.