Dr Busia has served as President of the Italian National Anti-Corruption Authority (ANAC) since 2020.

He is the vice president of the Network for Integrity and a member of the Executive Committee of the International Association of Anti-Corruption Authorities – IAACA.

Dr Busia worked at the Italian Data Protection Authority (DPA) from inception in 1997 and took office as Secretary General to the DPA in July 2012. He was a member of the Europol Joint Supervisory Body as set up by the Europol Convention from 1998 to 2005, where he was appointed as Chair of the Appeals Committee; he was also a member of the Joint Supervisory Authority set up by the Customs Information Systems Convention and served as deputy Chair of that Authority. From 2012, he is Alternate Member of the Article 29 Data Protection Working Party set up under the Directive 95/46/EC and has been a member of the ad hoc Committee on Data Protection (CAHDATA) established by the Council of Europe to modernize the Convention for the Protection of Individuals with regard to Automatic Processing of Personal Data (ETS No. 108). He served as Secretary General to the Italian Independent Oversight Authority for public procurement contracts (2008–2012) and was appointed as Director of the Permanent Board for the Relations between State and Regions (2006–2008). He held and still holds teaching courses in several Italian universities and has authored many scientific papers.