1. Professor in the Department of Statistics at the University of Nebraska‐Lincoln.
2. Professor in the Department of Pathology and Microbiology at the University of Nebraska Medical Center and director of the Nebraska Public Health Laboratory.
3. Assistant professor in the Department of Pathology and Microbiology at the University of Nebraska Medical Center and faculty scientist at the Nebraska Public Health Laboratory.
4. Professor and chair of the Department of Statistics at the University of South Carolina.
5. Associate professor in the School of Mathematical and Statistical Sciences at Clemson University.