1985-1986 Research Fellowship in the Laboratory of Reproductive Endocrinology, Department of Medicine, University of Washington School of Medicine & Seattle VAMC
1987-1988 Medical Intern, Greenwich Hospital Association, Yale University School of Medicine, Greenwich, CT
1987-1991 Residency in Psychiatry, Yale University School of Medicine, New Haven, CT
1990-1993 VA Psychiatry and Clinical Neurosciences Fellowship, West Haven VA Medical Center, West Haven, CT
1991-1992 Medical Director, Inpatient Unit, National Center for PTSD, West Haven, CT
1992-1996 Assistant Professor, Department of Psychiatry, Yale University School of Medicine
1993-1996 Associate Investigator, VA Career Development Award Program, West Haven VA Medical Center, West Haven, CT
1995-1997 Residency in Nuclear Medicine, Department of Diagnostic Radiology, Yale University School of Medicine, New Haven CT
1997-2000 Assistant Professor, Departments of Diagnostic Radiology and Psychiatry, Yale University School of Medicine
1997 Clinical Associate Physician, NIH-sponsored GCRC
1997-2001 Research Physician (Level II), VA Career Development Award Program
1997-2000 Director, Yale Trauma Research Program
1998-2000 Associate Director, Yale/VA PET Center
2000 Associate Professor in the Tenure Track, Departments of Diagnostic Radiology and Psychiatry, Yale University School of Medicine
2001-2006 Associate Professor of Psychiatry and Radiology, Emory University School of Medicine
2001-2006 Director, Emory Center for Positron Emission Tomography
2001-2012 Director, Mental Health Research, Atlanta VAMC
Attending Physician, Emory University Hospital and Emory Clinic, 2001-present
Staff Psychiatrist, Atlanta VAMC, 2001-present
Director, Emory Clinical Neuroscience Research Unit, 2001-present
Faculty Member, Neuroscience Graduate Program, Graduate Division of Biological & Biomedical Sciences (GDBBS), Laney Graduate School of Arts & Sciences, Emory University, 2005-present
Professor with Tenure of Psychiatry and Behavioral Sciences, Emory University School of Medicine, 2006-present
Professor of Radiology, Emory University School of Medicine, 2006-present