 In January 2016, after visiting Greece and meeting with refugee families fleeing the Syrian Civil War, Vayntrub co-founded a website and social media movement called #CantDoNothing to spotlight the European migrant crisis.She appeared in the television series "This Is Us".In July 2017, Vayntrub was cast in the lead role of Marvel Comics superheroine Doreen Green / Squirrel Girl in the "New Warriors" television pilot for Freeform.