Alex Blake

Alex Blake is a seasoned FBI linguistics expert and professor at Georgetown who joins the BAU during the premiere episode of Season Eight after Emily Prentiss left the BAU for a post at Interpol.

Background
Nothing in known yet about her private life previous to her incorporation to the BAU except that she's in a stable relationship.

As a forensic linguistics professor at Georgetown, she mentored Spencer Reid in the specialty and has hosted guess-lectures by him at her classes; all of it leads to think there is an ongoing friendship between both.