Michael J. Constantino, Ph.D.

Clinical Supervisor (Licensed Psychologist)

Michael J. Constantino, Ph.D. is an Associate Professor in the Department of Psychological and Brain Sciences at the University of Massachusetts Amherst where he directs his Psychotherapy Research Lab, teaches graduate and undergraduate courses on theories and techniques of psychotherapy, and supervises clinicians-in-training. Dr. Constantino’s primary scientific contributions include: (1) the investigation of patient, therapist, and relational processes that influence psychosocial treatments, (2) the development and testing of effective therapeutic interventions that address pantheoretical principles of clinical change, (3) the conduct of effectiveness research in psychotherapy training clinics, and (4) the interface of social and clinical psychology in the service of establishing clinical practice guidelines. Dr. Constantino has published both theoretical and empirical work in leading journals and books in the field, and he has received both internal and external grant support for his research. Among other positions served and honors received, Dr. Constantino is currently the President of the North American Society for Psychotherapy Research. He also maintains a small private psychotherapy practice with adult outpatients.


Katherine Dixon-Gordon, Ph.D.

Clinical Supervisor (Licensed Psychologist)

Dr. Dixon-Gordon is a Clinical Psychologist and Assistant Professor in the Department of Psychological and Brain Sciences at the University of Massachusetts Amherst, where she teaches courses on emotion and psychopathology and supervises clinicians in training.  She received her BS from the University of Washington, her MA and PhD from Simon Fraser University, and completed her internship and postdoctoral fellowship at the University of Mississippi Medical Center and GV Sonny Montgomery VAMC.  Her clinical and research interests focus on the role of emotion dysregulation in psychiatric conditions such as borderline personality disorder (BPD), self-injury, and other risky or impulsive behaviors.  Dr. Dixon-Gordon has extensive training and experience in cognitive behavioral and mindfulness-based approaches, and specializes in dialectical behavior therapy (DBT).  She has worked with adults, adolescents, and couples struggling with a variety of problems, including personality disorders, PTSD, substance use, eating disorders, and anxiety and mood disorders. 



Diane Farber

Diane Farber, Psy.D., is a Post-Doctoral Clinical Supervisor at the Psychological Services Center. She is also a Post-Doctoral Clinician at Mt. Holyoke College. She received her M.S. and Psy.D. in Clinical Psychology from Loyola University Maryland in Baltimore, and completed her pre-doctoral training at Kansas State University Counseling Services. She received her B.A. from Skidmore College in Saratoga Springs, New York. Dr. Farber's clinical interests lie in identity development, multicultural issues, emerging adult individuation and development, and training and supervision.

Sarah Fefer, Ph.D.

Dr. Sarah A. Fefer is currently an Assistant Professor of School Psychology in the Department of Student Development in the University of Massachusetts Amherst College of Education.  Dr. Fefer is also a Board Certified Behavior Analyst (BCBA) and works with students enrolled in an Advanced Practicum course at the Psychological Services Center to support the implementation of district-level, school-wide, and individual behavioral supports in schools throughout Western Massachusetts.  Dr. Fefer teaches courses focused on child and adolescent development, school-based prevention, single-subject design research methods, and developmental psychopathology.  Her research and clinical interests emphasize supporting children and adolescents with challenging behavior in home, school, and community contexts, and methods to promote collaboration across these important domains.  Principles of positive behavior support and applied behavior analysis drive this work, with an emphasis on prevention. Additionally, her research investigates biased self-perceptions among students demonstrating behavioral risk-factors, with an emphasis on academic, behavioral, and social competence.  Dr. Fefer previously held positions as a mental health clinician and behavior specialist in schools.  Dr. Fefer received a B.A. in Psychology from the University of Vermont, and an M.A. and Ph.D. in School Psychology from the University of South Florida.  

Richard Halgin, Ph.D.

Clinical Supervisor (Licensed Psychologist)

Richard Halgin, Professor of Psychology at the University of Massachusetts Amherst, is a licensed and board certified Clinical Psychologist as well as a Clinical Supervisor in the Psychological Services Center.  He received his Ph.D. from Fordham University, and completed a three-year fellowship in the Department of Psychiatry at New York Hospital-Cornell Medical Center.  He has had four decades of clinical experience as a psychotherapist, supervisor, and consultant.  Dr. Halgin is a member of the Massachusetts Board of Registration of Psychologists, and he previously served on the Ethics Committee of the American Psychological Association.  He is actively involved in graduate and undergraduate teaching, and was honored with the UMass Distinguished Teaching Award.  He has published more than sixty articles and book chapters, and is the co-author of Abnormal Psychology: Clinical Perspectives on Psychological Disorders (7th edition), editor of Taking Sides: Clashing Views in Abnormal Psychology (7th edition), and co-editor of A Casebook in Abnormal Psychology: From the Files of Experts.


Sheera Hefter, Ph.D.

Sheera Hefter, Ph.D is currently completing a post-doctoral Clinical Associate appointment in the Psychological Services Center. Sheera received a B.A. in Psychology and Jewish History from Stern College for Women, an MSEd in Educational Psychology and a Professional Diploma in School Psychology from Fordham University, and a Ph.D. in School Psychology from the University of Massachusetts in Amherst. Most recently, Sheera completed her pre-doctoral clinical internship in a multidisciplinary psycho-educational clinic, providing psychological evaluations, and individual therapy to clients ranging from primary school students through adults. She has been awarded research grants, from the UMass College of Education and the UMass Graduate School for her work related to extending the features of Positive Behavior Intervention and Supports (PBIS) to informal after school settings. She has co-authored articles on the application of PBIS to alternative high school settings and informal after-school settings. Her research interests include the training of school psychologists as system levels consultants, alternative applications of PBIS, and examining the role of treatment integrity in social-emotional learning curricula and research.  Prior to her doctoral studies, Sheera held positions as a general education teacher in grades k-8, an adjunct instructor in undergraduate psychology, and an informal educator for undergraduate and graduate college students. 

Timothy Hope, Ph.D.

Adjunct Clinical Supervisor (Licensed Psychologist)

Tim Hope, Ph.D. instructor at the University of Massachusetts Amherst, is a licensed Clinical Psychologist and Health Service Provider in private practice. He is a Clinical Supervisor at the Psychological Services Center. He received his Ph.D. from Penn State University and completed his pre- and post-doctoral training at the Worcester Youth Guidance Center at UMassMemorial Health Care. He also has been intensively-trained in Dialectical Behavior Therapy, served as a DBT Resource Team trainer and consultant for the State of Connecticut, and served as a Clinical Supervisor for the University of Hartford. Dr. Hope is actively involved in his work as a psychotherapist, psychological assessor, teacher, supervisor, and consultant.

Christopher Martell PhD

Clinic Director (Licensed Psychologist)

In July 2016, Dr. Christopher Martell was welcomed as the Clinic Director of the Psychological Services Center and a lecturer in the Department of Psychological and Brain Sciences at UMass Amherst. Dr. Martell has practiced empirically based treatments over the past 25 years. He has worked as a research therapist on three NIMH-funded clinical trials and has been a research consultant on psychotherapy treatment development and outcome studies using behavioral activation (BA) for depression in the U.S., U.K., and the Netherlands.  Furthermore, he has conducted and contributed to the development of lesbian, gay, bisexual and transgender (LGBT)-affirmative CBT with adults.  Dr. Martell is the first author of three books: Depression in Context: Strategies for Guided Action with Michael Addis, Ph.D. and Neil S. Jacobson, Ph.D. (2001), Cognitive-Behavioral Therapies with Lesbian, Gay and Bisexual Clients, with Steven Safren, Ph.D. and Stacey, Prince, Ph.D. (2004), and Behavioral Activation for Depression: A Clinician’s Guide (2010), with Sona Dimidjian, Ph.D. and Ruth Herman-Dunn, Ph.D. He has co-authored five other books, including: Overcoming Depression One Step at a Time:  The New Behavioral Activation Approach to Getting Your Life Back (2004), with Michael Addis.  Additionally, he has published in peer reviewed journals and contributed chapters to edited textbooks. His work has been translated into 7 languages. He has trained and supervised therapists around the world. Dr. Martell received his Ph.D. in clinical and School Psychology from Hofstra University in 1988. He is board certified in Clinical Psychology, and in Behavioral & Cognitive Psychology through the American Board of Professional Psychology.


William Matthews, Ph.D.

Clinical Supervisor (Licensed Psychologist)

William J. Matthews is a distinguished Emeritus Professor serving the University for many years as a Professor in the School of Education. Dr. Matthews now serves as a Lecturer in the Department of Psychological and Brain Sciences and as a Clinical Supervisor in the Psychological Services Center. In addition, he is the Director of Clinical training at the Vermont Brattelboro Retreat. In the initial part of his career, he achieved international recognition for his research on hypnotic phenomena and their applications to the clinical setting. He continues as a research consultant for the American Journal of Clinical Hypnosis. He was the editor of the 3 volume set Current Thinking and Research in Brief Therapy: Solutions, Strategies, Narratives, Volume I-III, Brunner/Mazel. While developing his clinical skills in hypnosis and cognitive approaches to psychotherapy, Dr.Matthews continued his research program on hypnotic phenomena and expectancy theory at the University publishing numerous articles amd book chapters while presenting at various professional conferences. Dr. Matthews received his B.A. from the University of Massachusetts and his Ph.D. from the University of Connecticut.


Rebecca Ready, Ph.D.

Psychological Assessment Supervisor (Licensed Clinical Neuropsychologist)

Rebecca Ready is an Associate Professor in the Clinical Division of the Department of Psychological and Brain Sciences, Division Head and Director of Clinical Training, and the Team Leader/Supervisor of the Psychological Service Center's ADHD Assessment program. Dr. Ready studies emotion and cognition in aging adults and in populations with neurodegenerative diseases, including Alzheimer's disease and Huntington's disease. She is interested in the interface between cognition and emotion in aging and how persons maintain life quality in the face of both minor and significant challenges. Current projects aim to discern associations between emotion regulation and memory, as well as increases in alexithymia with age.  Other projects pertain to outcomes assessment after neuropsychological evaluations for ADHD and Learning Disabilities.  Dr. Ready received her Ph.D. from the University of Iowa, and completed Internship and Post-Doctoral Residency in Clinic Neuropsychology at Brown Medical School. Dr. Ready is a licensed Clinical Neuropsychologist and her expertise is in psychological and neuropsychological assessment. She is also a member of the Neuroscience and Behavior Program at the University of Massachusetts. She teaches undergraduate and graduate courses in neuroscience, neuropsychology, and psychological assessment.


Claudia B. Rutherford, Ph.D.

Assessment Clinical Supervisor

Claudia B. Rutherford Ph.D., adjunct clinical faculty member, is a clinical psychologist in private practice in Deerfield. She specializes in psychological and neuropsychological testing of children and adults. She received her undergraduate degree from Brown University, a master’s degree in psychology from New York University, and a doctorate from Adelphi University. She completed an internship in neuropsychology, rehabilitation medicine, and health psychology at the Rusk Institute of Rehabilitation Medicine/New York University Medical Center. Prior to moving to Massachusetts, she worked as a research scientist in the neuroscience department at New York State Psychiatric Institute, doing clinical evaluations and psychiatric research. After moving to Western Massachusetts in 2002, she worked for several years at a child and family clinic in the Berkshires as a supervising psychologist. She has been in full-time private practice in Deerfield since 2006. One of very few healthcare providers in Western Massachusetts who offers assessment of children and adults, she is aware of the shortage of assessment psychologists in the region. This shortage has informed her practice and her advocacy efforts on behalf of both clients and the profession. Dr. Rutherford is a fellow and past board member of the Massachusetts Psychological Association. She is a board member and chair of the healthcare reform committee of the Massachusetts Neuropsychological Society. She is a member of the National Academy of Neuropsychology. She recently was given a presidential citation by MPA for her advocacy work in the Commonwealth and a Karl F. Heiser Presidential Award for Advocacy by APA.

Rebecca Stowe, Ph.D.

Clinical Supervisor/Faculty Clinician (Licensed Psychologist)

Rebecca M. Stowe is a lecturer in the Department of Psychological and Brain Sciences and a Clinical Supervisor in the Psychological Services Center.   Dr. Stowe specializes in child and adolescent clinical psychology. She is particularly interested in disruptive behavior disorders in young children, assessment and treatment of ADHD, parenting issues, parent-child relationships, and the use of cognitive-behavioral interventions with children and families. Dr. Stowe earned her B.A. from the University of Maine and her M.S. and Ph.D. from the University of Massachusetts-Amherst.  She completed a pre-doctoral internship at UMass Medical School/Worceser State Hospital and a post-doctoral fellowship in Clinical Child Psychology at Baystate Medical Center. 


Sara Whitcomb, Ph.D.

School Outreach Team Clinical Supervisor

Sara Whitcomb, Ph.D., is currently an Assistant Professor in the School Psychology program in the Department of Student Development at the University of Massachusetts in Amherst. She teaches courses pertaining to developmental psychopathology, psychology in the classroom, behavioral assessment, and school-based consultation. Dr. Whitcomb also works with children and families and directs the School Outreach Team, an advanced clinical training team for doctoral students at the UMASS Psychological Services Center.  Dr. Whitcomb works with several school districts on their implementation of School-wide Positive Behavioral Interventions and Support, and her current research efforts include investigation of quality implementation features and consultation related to school-based behavioral and social-emotional learning efforts. She has received research fellowships from the UMASS School of Education and the UMASS Center for Research on Families in the College of Natural Sciences and the College of Social and Behavioral Science. Sara has co-authored several articles, the fourth edition of a textbook entitled, Behavioral, Social, and Emotional Assessment for Children and Adolescence and the Strong Start social-emotional learning curriculum series. Sara has previously held positions as a special education and general education teacher in grades k-8 and as an educational consultant.  Dr. Whitcomb received a B.A. in Education and Psychology from Boston College, an Ed.M in Human Development and Psychology from Harvard University and a Ph.D. in School Psychology from the University oif Oregon.