He joins at a crucial juncture for the music industry's royalty collection agency, which - like the music industry as a whole - is battling to cope with changing music distribution and consumption trends in the digital age.
Earlier this month it emerged that Morrish - who is ex-Sony Music - had of late only been working part-time at Outside (PRWeek, 6 October).
At PPL, Morrish reports to chairman and CEO Fran Nevrkla, and replaces Jill Drew, who left in July.