John Gruber (born 1973) is a technology blogger, UI designer, and co-creator of the Markdown markup language. Gruber authors the Apple enthusiast blog Daring Fireball and produces its accompanying podcast, The Talk Show. History. Gruber is from Philadelphia, Pennsylvania. He received his Bachelor of Science in computer science from Drexel University, and worked for Bare Bones Software (2000–02) and Joyent (2005–06). . https://en.wikipedia.org/wiki/John_Gruber