She is the current holder of the Bergianus professorship at The Swedish Royal Academy of Sciences.
[citation needed] She earned her Ph.D. in 2000 at the Swedish Agricultural University in Uppsala.
[2] In 2013 she was named full professor at Stockholm University.
[1] Johannesson is known for her work on mycology and evolutionary biology.
[3][4] Johannesson was elected to the Royal Swedish Academy of Sciences in 2024.