Prof. Krueger's academic work is mainly focused in the field of labor economics. According to his bio, Krueger has "published widely on the economics of education, terrorism, labor demand, income distribution, unemployment, well-being, social insurance, labor market regulation and environmental economics."
For example, Krueger has examined the effect of minimum wage legislation on employment and, contrary to traditional economic theory, casts doubt on the principle that increasing the minimum wage decreases employment. He also co-authored a book on the subject with fellow economist David Card entitled Myth and Measurement: The New Economics of the Minimum Wage. A number of conservative economists take exception to Card and Krueger's findings, but their conclusions have, in large part, stood up to analytical scrutiny.
Prof. Krueger has also extensively examined the effect of education and school quality on economic outcomes and has found that factors such as smaller class sizes and otherwise "better" schools do have an impact on achievement and earnings, but he warns against dramatic reform to the public school system without further evidence that any proposed changes would actually have a significant positive effect. (You can see a complete review of this line of research here.)
Krueger has ventured into a few other areas of research, embarking on an inquiry into the individual and societal causes of terrorism and, on a somewhat brighter note, examining the economics of the music industry. In the policy realm, Krueger worked on the controversial "cash for clunkers" program and also clarified the debate on the costs of a proposed cap-and-trade plan.
Click here for Professor Krueger's complete CV.