Stig Ã…vall Severinsen (born 1973) is a four time World Champion freediver. Freediving consists of diving deep or long while holding your breath.
He holds a Master’s degree in biology (2001) and a PhD in medicine (2007) from the University of Aarhus, Denmark. During the last decade he has practiced and investigated the beneficial effects of breathing and breath holding on body and mind.

Through his company BlueConsult,, and his international web community breatheology, he offers courses and lectures on efficient breathing and mental training.
Join his community at