I am an emeritus professor of sociology at Texas A&M University. I have been a sociology and demography professor for almost 50 years. I served on the faculties of the University of Texas at Austin, Cornell University, and, since 1992, Texas A&M University. I am a demographer and conduct research in several areas, including the demography of race and ethnicity, international migration, the demography of sexual minorities, and the demography of China, Taiwan and Korea. In much of my research I pay special attention to the political and social implications of the results and their trends. At Texas A&M, I taught undergraduate classes in demography and graduate classes in statistics, demographic methods, and demography.
Per- and polyfluoroalkyl substances are a growing concern because of the many health impacts associated with exposure and their tendency to persist in the human body for months to years and in the environment for thousands of years.