Kirk Weinert is a liberal environmentalist activist and writer who has staffed and led numerous left-of-center non-profits throughout his career, many of which are or were affiliates of the controversial Public Interest Network. Weinert attended Tufts University. He is married and has one daughter. 
Weinert’s activist career began at Tufts University where he joined the Tufts Political Action Coalition to oppose nuclear energy and support divestment from South Africa in response to apartheid. 
In 1979, Weinert began working with the Public Interest Network (PIN), a national affiliation of over one hundred left-wing activist organizations. Weinert works as a senior writer and advisor for PIN in the “Development” and “Editorial and Creative” departments, where he is described as “the in-house expert on polling, data analysis and reporting, small donor fundraising strategy, ballot measures and democracy issues.” Weinert also co-founded PIN’s departments of publications, direct mail, telephone outreach, and membership services. 
Weinert has worked for numerous organizations under the umbrella of PIN. He was the president of the environmentalist group 2030 Fund until it went inactive in 2009.  He also served as director of the Fund for the Public Interest, a political activism group that targets environmental issues, from 2008 until 2013.  Concurrently, Weinert was the director of Environment Massachusetts from 2008 until 2010. 
Weinert has written dozens of articles for numerous publications, mostly on environmental consumption issues.
From September 2018 to September 2019, Weinert wrote 57 articles on Medium.com, a popular blogging platform, on topics ranging from the impact of pesticides on bee colonies to the hunting of pangolins.