He was the cofounder and lead developer of the Tumblr blogging platform from Tumblr's founding in 2007 until September 2010, when he left Tumblr to work on Instapaper full-time.
He was the cofounder and lead developer of the Tumblr blogging platform from Tumblr's founding in 2007 until September 2010. He left Tumblr to work on Instapaper full-time.