 War ended in May 1945 and Weisser immediately took on the leadership of the regional finance end economics ministry in what was then the state of Braunschweig, most of which had ended up in the British occupation zone.On 6 March 1946, now based in Hamburg, he was elected General Secretary of the administrative advisory board (""Zonenbeirat"") for the British zone.Later that year he became President of the General Association of communal housing development, a position he held on an honorary (unpaid) basis.