Grumbach’s current research looks at how groups like businesses and labor unions are able to influence policy at different levels of government – local, state, and national. His other interests include race and social class in American government, economic policy, and the politics of climate change. During high school and college, Grumbach worked as a busboy and restaurant host, and later interned with the hotel and restaurant workers union UNITE-HERE! Local 2. Grumbach was also active in the Occupy Wall Street movement.