Dr. Cohen's research focuses on three areas: migration, development and nutrition. Since the early 1990s he as studied the impact, structure and outcome of migration from indigenous communities in Oaxaca, Mexico to the US with support from the National Science Foundation. He has also conducted comparative research on Mexican, Dominican and Turkish migration. His work on traditional foods, nutrition and migration was supported by the National Geographic Society. In addition to ongoing work in Oaxaca, he is currently studying the migration of Mexicans to Columbus.