<P> John Carreyrou is a two - time Pulitzer Prize - winning investigative journalist with The Wall Street Journal . He has worked for the paper since 1999 and has been based in Brussels, Paris, and New York . </P> <P> Carreyrou graduated from Duke University in 1994 with a B.A. in political science and government . </P> <P> After graduation, he joined the Dow Jones Newswires . In 1999 he joined The Wall Street Journal Europe at Brussels . In 2001 he moved to Paris to cover French business and other topics such as terrorism . In 2003 he was appointed the deputy bureau chief for Southern Europe . He covered French politics and business, Spain and Portugal . By 2008 he was the deputy bureau chief and later bureau chief of the health and science bureau in New York . </P> <P> In late 2015 Carreyrou began a series of investigative articles on Theranos, the blood - testing start - up founded by Elizabeth Holmes, that questioned its claim to be able to run a wide range of lab tests from a tiny sample of blood from a finger prick . </P>

Damage control how messier kept cash crisis at vivendi hidden for months