The major focus of Kenneth's research is in the genetics of psychiatric and substance abuse disorders. Two major methodologies are used in this research. The first involves large population based twin samples. In these twins the aggregate role of genetic and environmental factors is addressed. The aim is to understand how these factors interact and correlate, and how, through development, the vulnerability to psychiatric illness and drug abuse is expressed. Samples have been taken from the Virginia Adult Twin Study of Psychiatric and Substance Use Disorders as well as Norway, Sweden and Holland. Kenneth's work has focused on a wide range of disorders including major depression, anxiety disorders, eating disorders, externalizing behaviors, alcoholism, and drug abuse. He has also worked towards understanding the genetic and environmental sources of comorbidity of psychiatric and substance use disorders.

Trained medical doctor always involved in philosophy of science, phenomenology, schizophrenia research and clinical work.

Prof. German Berrios, MD,
Chair in the Epistemology of Psychiatry
University of Cambridge, UK

Prof. Derek Bolton, M Phil, PhD
Professor of Philosophy & Psychopathology, Kings College London, Institute of Psychiatry and Hon. Consultant Clinical Psychologist, South London & Maudsley NHS Trust
Institute of Psychiatry, UK

Dr. Rachel Cooper, PhD
Senior Lecturer
Politics, Philosophy and Religion;
County South; Lancaster University, UK

Nicholas R. Eaton, MA
Doctoral Candidate
Department of Psychology
University of Minnesota, USA

Prof. Michael First, MD
Professor of Clinical Psychiatry
Columbia University, USA

Prof. Nassir Ghaemi, MD, MPH
Professor of Psychiatry and Pharmacology
Tufts University School of Medicine, USA

Prof. Assen Jablensky, MD, DMSc
School of Psychiatry & Clinical Neurosciences
The University of Western Australia
Centre for Clinical Research in Neuropsychiatry (CCRN)
Graylands Hospital, Australia

Kenneth S. Kendler,
Virginia Commonwealth University, USA

Prof. Robert Krueger, PhD
Hathaway Distinguished Professor
Department of Psychology
University of Minnesota, USA

Prof. Mario Maj, MD, PhD
Professor of Psychiatry
Director, Department of Psychiatry
University of Naples, Italy

Prof. Paul McHugh, MD
Distinguished University Professor
Former Director Dept. of Psychiatry and Behavioral Science
Johns Hopkins University, USA

Josef Parnas
University of Copenhagen, Denmark

Prof. Harold Pincus, MD
Professor and Vice Chair of the Department of Psychiatry
Co-Director, Irving Institute for Clinical and Translational Research
Columbia University, USA

Prof. Darrel A. Regier, MD, MPH
Executive Director,
American Psychiatric Institute for Research and Education
Director, Division of Research
American Psychiatric Association, USA

Prof. Kenneth Schaffner, PhD, MD
Distinguished University Professor
Dept. of History and Philosophy of Science
University of Pittsburgh, USA

Prof. Peter Zachar, PhD
Professor and Chair
Auburn University Montgomery
Department of Psychology, USA

"This book addresses many fundamental issues regarding psychiatry and psychiatric diagnoses as well as the future of psychiatry. It is important reading for anyone in the field." -- Michael Joel Schrift, D.O., M.A., University of Illinois at Chicago College of Medicine, Doody's

"Those wanting a deep understanding of the tensions in psychiatric classification will gain much from this volume, an understanding that hopefully someone or some team will use to get psychiatric classification unstuck." -- Journal of Clinical Psychiatry