He was head of research at the European Centre for Medium-Range Weather Forecasts from 1975 to 1981 and then director until 1990; then director of the Max Planck Institute for Meteorology in Hamburg. He became a recipient of the Milutin Milankovic Medal in 1996. He is now a senior research fellow at the Environmental Systems Science Centre in the University of Reading.
In 2005 he was awarded the René Descartes Prize for Collaborative Research together with Prof. Ola M. Johannessen and Dr. Leonid Bobylev from the Nansen Environmental and Remote Sensing Centre in Norway and Russia for the Climate and Environmental Change in the Arctic project. In 2006 he was awarded the 51st International Meteorological Organization Prize of the World Meteorological Organization for pioneering research in numerical weather prediction. In 2009 he was made an honorary fellow of the Royal Meteorological Society in recognition of his contribution to meteorology.
Environmental Research Letters rejection of paper in 2014
A draft paper discussing issues of climate sensitivity and uncertainties in the IPCC Fourth and Fifth Assessment Reports in relation to a recent paper by Otto et al. was submitted by Bengtsson and colleagues to Environmental Research Letters in February 2014, and was rejected in mid March after peer review by two referees who found that it did not meet the requirement to "significantly advance knowledge of the field". Following this, Bengtsson and his co-authors then requested the journal to publish it as a shorter "Perspective" article, but in early April the journal's editorial board turned this request down, adding that the paper contained errors and exceeded the normal size limit for "Perspective" pieces. They suggested that the errors should be corrected and a full length paper resubmitted with a new analysis of the data. The journal said they reject 65-70 percent of papers submitted.
Global Warming Policy Foundation
In a GWPF press release published by the Daily Mail on 15 May, Bengtsson said he had come under "an enormous group pressure" and said that "I see no limit and end to what will happen. It is a situation that reminds me about the time of McCarthy. I would never have expecting anything similar in such an original peaceful community as meteorology. Apparently it has been transformed in recent years." and " I had not expecting such an enormous world-wide pressure put at me from a community that I have been close to all my active life". 
As its lead story on 16 May under the headline "Scientists in cover-up of ‘damaging’ climate view", The Times said that the paper Bengtsson had submitted to Environmental Research Letters in February had been rejected for what Bengtsson called "activist" reasons. The publishers, the Institute of Physics, stated that the paper "which was the subject of this morning's front page story of The Times, contained errors, in our view did not provide a significant advancement in the field, and therefore could not be published in the journal." They said that "The comments taken from the referee reports were taken out of context and therefore, in the interests of transparency, we have worked with the reviewers to make the full reports available", and put online the referee reports from mid March when the paper had been rejected. Later that day, Bengtsson issued a statement that "I do not believe there is any systematic 'cover-up' of scientific evidence on climate change or that academics' work is being 'deliberately suppressed', as the Times front page suggests. I am worried by a wider trend that science is gradually being influenced by political views".
On 17 May, The Times reported that "Scientists from around the world sent messages of support to Professor Bengtsson". 
- Lennart Bengtsson at Meteorology Dept., University of Reading
- "EGU - Awards & medals - Milutin Milankovic Medal". European Geosciences Union. Retrieved 18 May 2018.
- Lennart Bengtsson received Descartes Research Prize 2005 Archived 2006-10-14 at the Wayback Machine.
- Award of 51st IMO Prize by WMO Archived 2012-07-29 at Archive.is
- Commissariat, Tushna (16 May 2014). "Dispute arises over rejected climate-science paper - physicsworld.com". Institute of Physics. Retrieved 19 May 2014.
- Harvey, Fiona (16 May 2014). "Rejected climate science paper contained errors, says publisher : Environment". The Guardian. Retrieved 16 May 2014.
- "Lennart Bengtsson resigns"., thegwpg.org, may 5, 2014
- Climate change scientist claims he has been forced from new job in 'McCarthy'-style witch-hunt by academics across the world, Mail Online, 15 May 2014
- Scientists in cover-up of ‘damaging’ climate view, The Times, 16 May 2014
- Scientists condemned for political bias on climate change, The Times, 17 May 2014
- Interview / biography
- Lennart Bengtsson: Global climate change and its relevance for a global energy policy, published at Die Klimazwiebel, March 12, 2013
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