Matt Cutts, on leave from Google since 2014, officially left the company for the US Digital Service at the end of 2016. This according to an article in Search Engine Land.
To this day, his videos and advice prove exceptionally useful to newbie SEOs trying to understand how Google works and what to do (or not to do) to make their sites great. For all those years of teaching, listening, and counseling, thank you Matt Cutts! Best wishes for the future.