Kári Stefánsson, (born 1949, Iceland) is an Icelandic neurologist, who is the President, Chairman, CEO and co-founder of deCODE Genetics. He has pioneered the monitoring of the DNA of a large fraction of an entire country's population leading to a complete genealogy of its native inhabitants. This has led to the discovery of the neuregulin-1 gene's association with schizophrenia.