Ian C. Fischer, PhD

Department of Psychiatry, Yale School of Medicine, New Haven, Connecticut; US Department of Veterans Affairs National Center for Posttraumatic Stress Disorder, VA Connecticut Healthcare System, West Haven, Connecticut

JCP
Geographic Differences in Cannabis Use and Cannabis Use Disorder in the US Veteran Population
Original Research

January 19, 2026

Significant regional differences were observed in cannabis use and cannabis use disorder (CUD). Veterans in the Pacific region had the highest rates of cannabis use and CUD.
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JCP
Identifying Factors Linked to PTSD Among Younger US Military Veterans
Original Research

September 17, 2025

Younger veterans were 3 times more likely to screen positive for PTSD compared to older veterans, with psychosocial difficulties contributing most to this association.
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JCP
Psychosocial Correlates of Optimism among US Military Veterans
Brief Report

April 21, 2025

Positive psychosocial characteristics (PPCs) such as curiosity, perceived resilience, and purpose in life were strongly linked to optimism scores, suggesting a role for interventions that target other PPCs in...
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PCC
Suicide-Specific Cognitions in US Military Veterans
Original Research

January 14, 2025

This study examined data from a large, nationally representative sample of US veterans to determine the prevalence and correlates of high chronic suicide risk.
, , , et al
JCP
Sex Differences in PTSD among US Military Veterans
Brief Report

December 16, 2024

Sex differences in PTSD were attributable to differential exposure to traumatic events such as childhood sexual assault and military sexual trauma and to social factors such as greater loneliness.
, , , et al
JCP
Prevalence, Correlates, and Burden of Subthreshold PTSD in US Veterans
Original Research

October 23, 2024

Subthreshold PTSD affects 3.5% of US military veterans and is associated with increased rates of psychiatric disorders, suicidal thoughts and behaviors, and functional difficulties.
, , , et al
PCC
Psychological Resilience of Mental Health Workers During the Russia-Ukraine War
Original Research

October 22, 2024

Interventions that bolster social connectedness, meaning in life, and optimism may help promote psychological resilience among mental health workers exposed to ongoing war-related and work-related stressors.
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Consensus Report on XT Use in Practice

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Figure: Graphic promoting Consensus Report on Xanomeline-Trospium; colorful net design shown with JCP logo in lower left.

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