He is among the central developers of didactic methods in natural sciences in Norway.
He is known for textbooks in natural sciences for all levels of primary and secondary education, and for Naturfagenes didaktikk.
[1] Sjøberg also participated in the public debate on education policy.
He won the University of Oslo's science communication prize in 2013.
[2] Sjøberg was inducted into the Norwegian Academy of Technological Sciences in 2005 and the Norwegian Academy of Science and Letters in 2009.