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Butler Hospital
Butler Hospital

OCD Research Program


Steven A. Rasmussen, MD
Director, Obsessive-Compulsive Disorder Program, Butler Hospital
Mary E. Zucker Professor & Chairman, Department of Psychiatry and Human Behavior Brown Medical School

Dr. Rasmussen received his MD from Brown Medical School and completed his psychiatry residency at Yale University. Since then, he has devoted his efforts to the research and treatment of OCD and is acclaimed internationally for his work in the field. Dr. Rasmussen has been recognized by The Best Doctors in America annually for over 20 years.  He has authored and co-authored over 130 publications and has lectured at conferences and symposiums across the world regarding this illness. His research has been focused on long term outcome studies of OCD,  epidemiologic studies, and integrated approaches to treatment. Along with Dr. Greenberg, he is pioneering the use of Gamma Knife Capsulotomy and Deep Brain Stimulation to treat OCD sufferers who fail to respond to conventional medication and psychotherapy. He was the 2014 recipient of the International OCD Foundation lifetime achievement award.

Benjamin D. Greenberg, MD, PhD
Chief, Outpatient Services, Butler Hospital
Professor, Department of Psychiatry and Human Behavior
Brown Medical School

Dr. Greenberg's background includes a PhD in Neurosciences from the University of California, San Diego, an MD from the University of Miami, training in neurology at Columbia University, and a psychiatry residency at Johns Hopkins Hospital. After residency, he worked for the Laboratory of Clinical Science at the National Institute of Mental Health. He subsequently became Chief of the Adult Obsessive-Compulsive Disorder (OCD) Research Unit, where he initiated studies in OCD using Transcranial Magnetic Stimulation (TMS).

In 2000, Dr. Greenberg joined the OCD Research Group at Butler Hospital and Brown Medical School. His main work now is developing brain stimulation treatments, either noninvasive or surgical, for people with OCD or other conditions. The noninvasive methods include TMS and electrical stimulation to the scalp (e.g., tDCS). Invasive or surgical therapies include Gamma Knife Ventral Capsulotomy for OCD and Deep Brain Stimulation for OCD. These efforts include collaborative translational research using neuroimaging, neuroanatomy, neurophysiology, and cognitive neuroscience techniques to better understand the neurocircuitry of OCD and other conditions, that is affected by neuromodulation. Dr. Greenberg also has interests in OCD symptom sub-typing and in OCD and personality genetics.

Jane Eisen, MD
Professor & Vice Chair of Academic Affairs, Department of Psychiatry and Human Behavior
Brown Medical School

Dr. Eisen received her MD from the New York University School of Medicine and completed her psychiatric residency at the Mt. Sinai Hospital in New York.  Dr. Eisen has extensive clinical experience in OCD, and has served as Director of the Butler OCD Clinic. She has conducted research in OCD for several decades, and has authored or co-authored over 60 publications, presenting on OCD nationally and internationally.  Her research interests in OCD have included pharmacologic interventions, symptom sub-typing and long term outcome studies.  


Christina L. Boisseau, PhD
Research Psychologist, Butler Hospital
Assistant Professor (Research), Department of Psychiatry and Human Behavior
Brown Medical School

Dr. Boisseau received her PhD in Clinical Psychology from Boston University in 2011 and completed both her internship and postdoctoral fellowship at the Alpert Medical School of Brown University. Dr. Boisseau's research background is in anxiety and eating disorders, with a focus on examining underlying diatheses both within and across diagnostic categories. Primary research interests include transdiagnostic treatment development and identifying temperamental predictors of OCD course and treatment response.  She is currently co-investigator of the Brown Longitudinal OCD Study and Principal Investigator an NIH-funded study investigating the discontinuation of long-term serotonin reuptake inhibitors in OCD.   

Sarah L. Garnaat, PhD
Research Psychologist, Butler Hospital
Assistant Professor (Research) Brown Medical School

Dr. Garnaat received her PhD in Clinical Psychology from the University of Houston in 2011. She completed a treatment research T32 postdoctoral fellowship at the Alpert Medical School of Brown University and is currently completing additional fellowship training in translational neuroscience of OCD. Dr. Garnaat's background is in assessment and treatment of anxiety disorders and serious mental illness. Her primary research interests include leveraging basic neuroscience methods and research to inform treatment development in OCD and anxiety disorders, as well as using psychosocial interventions to examine mechanisms of recovery.

Maria Mancebo, PhD
Research Psychologist, Butler Hospital
Assistant Professor (Research) Brown Medical School

Dr. Mancebo received her received her Ph.D. in Clinical-School Psychology from Hofstra University in 2002. She joined the OCD Research Program in 2001 and completed a post-doctoral fellowship with Drs. Steven Rasmussen, Jane Eisen, and Matt Evans. She is currently an Assistant Professor (Research) in the Department of Psychiatry and Human Behavior at Brown. She has expertise in cognitive-behavioral therapies (CBT) for OCD and hoarding.Dr. Mancebo's main research interests are in the long-term outcome of treatments for OCD and developing behavioral treatments for underserved populations. She is a co-investigator of the Brown Longitudinal OCD study and the Principal Investigator of a study to develop behavioral treatments for low-income populations with OCD. She has authored and co-authored manuscripts/chapters on phenomenology of OCD across the lifespan, co-occurring disorders, stability of OCD symptoms over time, and treatments of OCD in clinical settings.

Nicole C. McLaughlin, PhD
Neuropsychologist, Butler Hospital
Assistant Professor (Research), Department of Psychiatry and Human Behavior
Brown Medical School

Dr. McLaughlin received her PhD in 2006 from Suffolk University, and completed her postdoctoral fellowship in 2008 at the Alpert Medical School of Brown University. She is a neuropsychologist at Butler Hospital and an assistant professor at Brown. Dr. McLaughlin has a K23 career development grant award from the NIMH to investigate MRI changes in functional and structural connectivity after gamma knife capsulotomy for intractable OCD.  She is also neuropsychology coordinator and co-investigator of the deep brain stimulation trial for OCD. Primary research interests are in investigating outcomes of neurosurgical interventions in OCD using cognitive and neuroimaging tools.

Agustin Yip, MD, PhD
Psychiatrist, Butler Hospital
Clinical Assistant Professor, Department of Psychiatry and Human Behavior
Brown Medical School

Dr. Yip received his medical degree from the University of the Philippines, completed a PhD in Epidemiology from the University of Cambridge, and trained in Psychiatry at Brown University. He joined Butler Hospital/Brown University 2008, where he is a research psychiatrist on clinical trials of neuromodulation (deep brain stimulation, repetitive transcranial stimulation) for refractory obsessive-compulsive disorder and depression.

Research Staff

Lynn Hana, BS
Research Assistant

Lynn Hana joined the OCD Research group at Butler Hospital in October 2014. She received a Bachelor of Science degree in Psychology and a minor an Studio Art from the University of Rhode Island. Lynn previously served as an undergraduate research assistant at Cancer Prevention Research Center at the University of Rhode Island, and the Pediatric Anxiety Research Clinic at Rhode Island Hospital, where she became involved in tic and obsessive compulsive disorder research.

Roberta McMahon, MA
Patient Coordinator

Roberta McMahon received her Master of Arts degree in the disciplines of clinical psychology, philosophy, sociology and anthropology. She achieved a Bachelor of Arts degree in Biology and pursued graduate studies in biology and chemistry. Following 25 years as Director of Student Development and Counseling Services at the Rhode Island School of Design Roberta pursued her interest in research and joined the OCD studies staff.  In her position as Patient Coordinator Roberta screens OCD patients inquiring and interested in Deep Brain Stimulation (DBS) and Gamma Knife surgeries for OCD. She assists and guides patients through the application process and, if they qualify for either surgery, supports them through the surgery and aftercare.

Jessica Lawton, BA
Research Assistant 

Jessica Lawton joined the OCD Research Group at Butler Hospital in June 2013.  She received a Bachelor's degree in Psychology from Brown University in 2010 and previously served as a senior research assistant on NIH-funded projects at The Weight Control & Diabetes Research Center (TMH/Brown Alpert Medical School).  Her research interests include utilization of behavioral interventions to promote adoption and maintenance of healthy lifestyles and the translation of evidence-based practice to community mental health settings.  She currently works on Dr. Maria Mancebo's research initiatives involving the development of behavioral treatments of OCD in underserved populations.

Carly Schwartzman, BA
Research Assistant

Carly Schwartzman is a research assistant working with the OCD research group at Butler Hospital. Carly graduated from the University of Miami in May 2014 with a Bachelor of Arts degree in Psychology and a minor in Business Administration. While pursuing her Bachelor's degree, she was actively engaged in the Child and Adolescent Mood and Anxiety Treatment (CAMAT) program, with whom she wrote her senior honors thesis, as well as the Bridging Research on Anxiety, Neuroscience, and Innovations (BRAIN) group. Carly plans to pursue a PhD in Clinical Psychology.

Julianne Voss, BA
Research Assistant 

Julianne Voss joined the Brown Longitudinal Obsessive-Compulsive Study at Butler Hospital in July 2013. Julianne has ten years of experience as a clinical interviewer. Prior to her current position, she conducted interviews for the Harvard/Brown Anxiety Research Project and a study investigating anxiety and anger in U.S. veterans returning from Iraq/Afghanistan. She has also worked as a patients' rights advocate and case manager for a community mental health center. Julianne is currently in the Master's degree program at the Rhode Island College School of Social Work.


Christine Conelea, PhD
Staff Psychologist, Rhode Island Hospital
Department of Psychiatry and Human Behavior Brown Medical School 

Dr. Conelea received her PhD in 2011 from the University of Wisconsin-Milwaukee. She completed her postdoctoral fellowship at the Alpert Medical School of Brown University, first as a fellow on the T32 in Child Mental Health and then as a recipient of an F32 National Research Service Award from the NIMH. Dr. Conelea is based at the Pediatric Anxiety Research Clinic at Rhode Island Hospital and is interested in tic and obsessive-compulsive spectrum disorders. She is currently collaborating with Dr. Greenberg and the Butler OCD Clinic as part of her K23 career development award from the NIMH, which is examining neurobehavioral factors involved in chronic tic disorders.

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