It's a variation on a LaTeX style called classicthesis (http://www.miede.de/#classicthesis http://www.miede.de/#classicthesis) based on Robert Bringhurst's Elem

It's a variation on a LaTeX style called classicthesis (http://www.miede.de/#classicthesis http://www.miede.de/#classicthesis) based on Robert Bringhurst's Elements of Typographic Style. Unfortunately this particular version has messed up some things (notably line length), so use the original!