John Gruber (born 1973) is a blogger from the greater Philadelphia, Pennsylvania area of the USA. Gruber received his Bachelor of Science in computer science from Drexel University. He worked for Bare Bones Software from 2000 to 2002 and Joyent from 2005 to 2006. His main project is Daring Fireball, a technology blog that has become his full time job; one side project is Markdown, a lightweight markup language. He co-hosts a podcast called The Talk Show with Dan Benjamin.
In January 2010 Gruber was elected president of Letters.app, a project aiming to produce a new IMAP email client for Mac OS X.