I Read in today's Gainesville Sun that the Character of Mickey Haller is based loosely on Dan Daly. Mr. Daly used to be The Author's roommate when they went to The University of Florida. Dan is now a Criminal defense attorney in Gainesville.
This Photo from the Gainesville Sun, and is of Michael Connely (the Author) on the Left. The guy next to him is an Attorney named Roger Mills, Dan Daly is next to him and then of course McConaughey.