Viking Olov Björk (3 December 1918, in Sunnansjö, Dalarna – 18 February 2009)[1] was a Swedish cardiac surgeon.
Björk wrote his dissertation in 1948, titled "Brain perfusion in dogs with artificially oxygenated blood".
In 1980 Björk wrote to Pfizer threatening to publish cases of valve failures—often fatal to the patients—unless corrective action was taken.
This eventually led to long lawsuit that involved the recall of all existing valves and Pfizer allocating up to US$20 million to pay compensation.
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