Graham Cluley (born 8 April 1969) is a British security blogger and commentator whose career traces the rise of both personal computing and cyber threats. He first gained attention in the late 1980s and early 1990s as an independent creator of humorous interactive fiction PC games, notably Jacaranda Jim and Humbug. Distributed as shareware on floppy disks and promoted through computer magazines, these text adventures were praised as “shareware masterpieces,” and Cluley later released them into the public domain alongside two later graphical games, Blox and Wibbling Wilf.
Cluley then shifted into the emerging computer security industry, joining British anti-virus firm S&S International (later Dr Solomon's Software), where he wrote the first Windows version of Dr Solomon's Anti-Virus Toolkit. In 1999 he moved to Sophos, serving until 2013 as Senior Technology Consultant, spokesperson, Head of Corporate Communications, and editor of the company’s Naked Security site. His approachable style and active online presence earned recognition from Computer Weekly, which named him Twitter user of the year in 2009 and 2010.
In April 2011, Cluley was inducted into the InfoSecurity Europe Hall of Fame. Beyond writing his daily blog at grahamcluley.com, he co-hosts the weekly Smashing Security podcast with Carole Theriault and has engaged in public battles with virus writers, including the creator known as “Gigabyte.” A sought-after public speaker, he has presented to major companies, collaborated with law enforcement on hacking investigations, and frequently appears on television and radio to explain security threats to the public.