Dr. Squier joined the College of Dentistry in 1975. He is a professor in the Department of Oral Pathology, Radiology and Medicine, and in the Dows Institute for Dental Research. Dr. Squier is also director of graduate studies at the College of Dentistry, and since 2007, he has been director of Global Health Studies at the University of Iowa.
Dr. Squier teaches undergraduate students and predoctoral and postdoctoral dental students.
For over twenty-five years, Dr. Squier's research has focused on the structure and function of stratified squamous mucosae, with particular regard to the nature of the superficial permeability barrier structure and the role of topical carcinogens and micro-organisms in the pathogenesis of local and systemic disease. Specific areas of interest have been interactions between alcohol and tobacco components in the development of oral cancer and the mechanisms by which Staphylococcae and their toxins are involved in the vaginal pathogenesis of toxic shock syndrome. More recently, he has been concerned with the role of oral health professionals in assisting their patients with tobacco cessation. Dr. Squier has published more than 200 books, chapters, and peer-reviewed articles.
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Dr. Squier is an honorary member of the Hungarian Dental Association, a member of the International Association for Dental Research, the Institute of Biology (London, England), the International Society for Sterology, the British Society for Oral Pathology, the International Association of Oral Pathologists, and the Heartland Global Health Consortium.