Peter Ferrie began working with computers in 1981.
In 1986, he began developing anti-virus software for Apple II PCs.
From 1992-1998, he worked for an Australian distributor of anti-virus software for IBM PCs, first Viruscan then F-Prot.
From 1998-2000, he worked for Frisk Software International in Iceland.
From 2000-2003, he worked for Symantec Corporation in Australia.
From 2003-2008, he worked for Symantec Corporation in the USA.
In 2008, he joined Microsoft Corporation.