Witko's primary research focuses mostly on how public policies shape and respond to economic outcomes like unemployment and inequality, and the role of the public and organized interests in developing public policy. His book The New Economic Populism: How States Respond to Economic Inequality won the State Politics and Policy Section's Virginia Gray best book award in 2018. His research focuses a great deal on inequality and to some extent and poverty and to a lesser extent environmental issues. All are important themes of the UN Sustainable Development Goals.
I have taught courses on income inequality and environmental politics and policy.