Diego Creimer worked in television and film production in his homeland, Argentina, before settling in Québec in 1999. He has made films and documentaries on homeless children in Buenos Aires and on indigenous peoples. who are fighting against deforestation in the subtropical regions of northwestern Argentina. In Québec, he worked for six years as a radio journalist for CBC / Radio-Canada International, then for Greenpeace from 2012 to 2016, where he was in charge of communications for the Arctic campaign, and finally he joined the David Suzuki Foundation in 2016 as head of public affairs and communications.

With three colleagues from the Foundation (Karel Mayrand, Louise Hénault-Ethier and Julie Roy) he co-wrote and published in 2018 a collection of essays and testimonials on the ecological transition, Demain le Québec, with Éditions La Presse. This book approaches 7,000 copies sold and has inspired the creation or reactivation of several ecological transition groups in Québec.