Contemporary PL designers who have inspired my programming language design journey the most are people like Chris Granger (Eve), Jamie Brandon (Eve/Imp/others), Bret Victor (Dynamicland), Chris Lattner (Swift / Mojo), Simon Peyton Jones (GHC/Verse), Rich Hickey (Clojure), and Jonathan Edwards (Subtext). My favorite researcher is Amy J. Ko for her unique perspective on the nature of languages. Check out her language "Wordplay" which is very interesting.