Arne Schoenbohm came under scrutiny in recent weeks after a satire TV show highlighted his ties with a cybersecurity consultancy which counted as a member a German subsidiary of a Russian firm founded by a former KGB employee.
He told Reuters he was no longer active in the council and had only delivered the keynote speech at its 10th anniversary in September as an exception after receiving the green light from the interior ministry.
The consultancy last week protested it had not known of the alleged ties to Russian services of Protelion GmbH, which it expelled after the TV programme was aired.
The consultancy said the interior ministry knew of the allegations since at least spring but "no information was provided to associations or potential customers by official bodies".
The head of Protelion GmbH was not immediately available for comment.