CAMBRIDGE, Mass. — Former New Zealand Prime Minister Jacinda Ardern, who led her country through a devastating mass shooting, will be temporarily joining Harvard University later this year, Kennedy School Dean Douglas Elmendorf said Tuesday. Ardern, a global icon of the left and an inspiration to women around the world, has been appointed to dual fellowships at the Harvard Kennedy School. She will serve as the 2023 Angelopoulos Global Public Leaders Fellow and a Hauser Leader in the school’s Center for Public Leadership beginning this fall. “Jacinda Ardern showed the world strong and empathetic political leadership,” Elmendorf said in statement,...