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Wallenius was born in 1968 in Trollhättan, Sweden. At the age of 18, he won the particle physics contest on the Swedish television show "Kvitt eller Dubbelt" (Double or Nothing), after which he was nicknamed "partikel-Janne". He studied Engineering Physics at Chalmers University of Technology in Göteborg from 1987 to 1992. He got his PhD degree in Quantum Chemistry from Uppsala University in 1996.
In 2008 he was promoted to full professor at KTH.
In 2013, he co-founded the company "LeadCold Reactors" which designs small lead-cooled fast reactors called SEALER for commercial power production in arctic communities. LeadCold Reactor has been listed as one of the 71 hottest start-ups in Sweden,
In 2016 Wallenius appointed one of Sweden's 10 most innovative entrepreneurs by Foundation ÅForsk and Swedish Incubators & Science Parks.
|Wikimedia Commons has media related to Janne Wallenius (physicist).|
- Karlsberg, Lars Anders (December 13, 2011). "The Wild Party in the Reactor Hall". NYTeknik. Retrieved 3 June 2015.
- Veckans Affärer, 29:e maj 2015
- "Janne Wallenius appointed one of Sweden's 10 most innovative entrepreneurs". April 6, 2016. Retrieved January 3, 2017.