 From 1976 till 1980, Gehrmann was a full-time desk-officer manager, both in Federal Statistical Office and in State Government of Hesse.In 1980, he was offered and accepted a chair at the Federal University of Applied Administrative Sciences (Bruehl/ Bonn).During this time, he undertook several time-limited delegations to Federal Ministries in Bonn for highly specialised issues in economic, social and environmental fields.