Dr. Trejo's primary research focus is in the field of labor economics. He has examined the response of labor market participants to the incentives created by market opportunities, government policies, and the institutional environment. Specific research topics he has studied include: the economic effects of overtime pay regulation; the impact of labor unions on compensation, employment, and work schedules; immigrant labor market experiences and welfare recipiency; and the relative economic status and intergenerational progress of Mexican Americans.