Johannes Aleidis (Johan) Ringers (Alkmaar, 2 January 1885 – The Hague, 6 May 1965) was a Dutch hydraulic engineer and politician. He served as the director-general of Rijkswaterstaat and later as the director of Dutch East Indies Railways. During World War II, Ringers was appointed as the government commissioner for reconstruction, but was later interned by German forces. After World War II, he became the Minister of Public Works and Reconstruction in the Schermerhorn and Beel I cabinets. Finding himself in disagreement with the Dutch East Indies policy of the Netherlands government, he resigned in 1946. He was the brother of Hendrik Ringers who founded the Ringers chocolate company, and served on the supervisory board of that company.
Education and Early Career After completing his education at the Hogere Burgerschool in Alkmaar, Ringers studied at the Technical University of Delft, where he obtained his diploma in Civil Engineering in 1906. He initially worked for Rijkswaterstaat in the district of Goes and contributed to the construction of locks at Hansweert in the Kanaal door Zuid-Beveland. In 1911, he published an article in the journal De Ingenieur about lock gates in Germany and Belgium. In 1916, he moved to Java and took up the role of chief engineer for the Dutch East Indies Railway Company. He returned to Rijkswaterstaat in 1920 and worked on canalisation in West Friesland, publishing a technical report on the work in 1922.
Noordersluis van IJmuiden
Ringers became the project leader for the construction of the Noordersluis van IJmuiden. Together with Paul Josephus Jitta, he designed and led the construction of the lock, publishing several works on the subject. In recognition of his work on the Noordersluis, he was awarded the Conrad Medal by the Dutch Royal Institute of Engineers in 1926. After completing the IJmuiden project, Ringers became involved with the Zuiderzee Works as chief director of the Maatschappij tot Uitvoering van Zuiderzeewerken on 1 January 1927.
Director-General of Rijkswaterstaat In 1930, Ringers was appointed Director-General of Rijkswaterstaat. In 1935, he also became a member of the board of directors of the Netherlands-Indian Railway Company, based in The Hague. He held various honorary positions, including vice-chairman of the Waterloopkundig Laboratorium, chairman of the Association of Delft Engineers, vice-chairman of the Royal Institute of Engineers (of which he became an honorary member in 1955), member of the National Commission for Drinking Water Supply, chairman of the Dutch Delegation to the Permanent International Association of Navigation Congresses (PIANC), and a member of the standing committee for Port Policy of the Economic Council. In September 1930, he received an honorary doctorate from Delft University of Technology, followed in June 1932 by an honorary doctorate from the Danzig University of Technology, allowing him to use the title dr. ir.
Second World War The Second World War marked a significant turning point in Ringers' career. Before the outbreak of war, the Dutch Minister of Defence had ordered measures to prevent enemy action from damaging hydraulic engineering structures. The precautions taken at that time, based on Ringers’ advice, proved effective. By 30 May 1940, all areas of the Netherlands which had been flooded during the German invasion were dry and rehabilitated. On 21 May 1940, General Winkelman appointed him Government Commissioner for Reconstruction, a position that was renamed General Authorised Representative for Reconstruction and for the Construction Industry in the Occupied Dutch Territory on 23 December 1940. On Ringers' advice, decisions were made within a few days to bring all areas of land where buildings in Rotterdam had been destroyed by German bombing into state ownership, thereby allowing immediate disposal of rubble and commencement of reconstruction. It was also decided to move the location of major Dutch sea defences. To this end, he commissioned Johan van Veen to study the required safety level of the country’s dikes. In recognition of his efforts, Rotterdam honoured him in 1963 as the "father of reconstruction" with a plaque in the office of municipal public works, the Stadstimmerhuis. At the beginning of the occupation of the Netherlands, Ringers established contact with the banker E.E. Menten, who was involved in espionage activities. During an inspection trip as the General Representative for Reconstruction and the Construction Industry, Ringers was arrested by the Sicherheitsdienst on 1 April 1943. His arrest was part of mass detentions ordered by J. Schreieder, head of Referat IV E of the Sicherheitspolizei, targeting the Vorrink Group and the National Committee in the context of the Englandspiel, a German counterintelligence operation. Ringers spent about seven and a half months in prison in Scheveningen, where he continued some of his work, including designing a plan for heating the city of Rotterdam using primitive methods. He was then transferred to the Herzogenbusch concentration camp in Vught for four months, spent three weeks as a hostage in St. Michielsgestel, and was finally imprisoned in the Sachsenhausen concentration camp in Germany until May 1945.
After the war
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