Migrant Clinicians Network advocates for migrants and clinicians, develops appropriate resources, engages outside partners, conducts translational research, and runs programs that support clinical care on the front line of migrant health. Migrant Clinicians Network's goal is to improve health care for migrants by providing support, technical assistance, and professional development to clinicians in Federally Qualified Health Centers and other healthcare delivery sites with the ultimate purpose of providing quality health care that increases access and reduces disparities for migrant farmworkers and other mobile underserved populations. In this article the authors examine the migrant population in the United States, a brief history of clinicians working in migrant health, and the scope of current Migrant Clinicians Network activities, including occupational and environmental health.