From 1985 to 1991 he worked as a judge at the Regional Court Munich I, civil division, and from 1991 to 1998 he was a prosecutor at the prosecutor's office Munich II, as head of department responsible for tax evasion, economic crimes and organized crime.
From 1998 to 1999 he was senior public prosecutor at the Higher Regional Court Munich, where he was head of division and responsible for money laundering, organized crime and international relations.
[6] In Bulgaria he was assigned by the European Union to advise the government and to help build a prosecutor's office specialized on corruption.
[14] End of 2014, his work was criticized by the chief investigator of the FIFA Ethics Committee Michael J. Garcia.
[18] Upon closure of the procedure, Eckert announced on 21 December 2015 the sentence and imposed upon both a ban of eight years as well as fines.
[23] Together with Cornel Borbély,[24] the former chairman of the investigatory chamber of the FIFA Ethics Committee, and Marc Tenbücken, a communications expert, Borbély founded the Sports Governance Unit in November 2017,[25] which advises sports associations, clubs and sponsors on good governance.
[8] In his spare time he also visits a Realschule in the Bavarian Oberland to explain the judiciary system to students and to answer their questions.