Libby Lewis, Ph.D.

Licensed Clinical Psychologist

Pronouns: She/Her/Hers

Dr. Libby Lewis, Licensed Clinical Psychologist

Licensed in MA.

Clinical Expertise

Dr. Lewis specializes in evidence-based treatments for OCD, mood and anxiety disorders, and has experience treating longer-standing patterns of emotion dysregulation as well. She is particularly interested in mindfulness-infused therapies, such as Acceptance and Commitment Therapy (ACT) and Dialectical Behavioral Therapy (DBT). Therapy with Dr. Lewis balances symptom reduction with defining and moving towards what truly matters to clients in their specific lives.

Diversity, Equity, & Inclusion

It is deeply personally and professionally important to Dr. Lewis to foster an affirming, inclusive, and safe environment in the therapy room for clients who hold marginalized identities. She is committed to continually seeking out opportunities to grow in her awareness of and competency working with clients who hold a variety of sociocultural identities.


Dr. Lewis received her BA in psychology with a minor in music from Cornell University in 2012, and received her PhD in clinical psychology from Yale University in 2020. She completed her predoctoral clinical internship at McLean Hospital/Harvard Medical School and stayed for her postdoctoral fellowship at the Behavioral Health Partial Program at McLean, where she served as Co-Director of the BHP Practicum Program. Dr. Lewis worked as a postdoctoral fellow at McLean’s OCD Institute before transitioning into her current role as a staff psychologist at the OCD Institute and the Pavilion at McLean.


  • Cornell University, BA, 2012
  • Yale University, PhD in Clinical Psychology, 2020
  • Harvard Medical School/McLean Hospital, Predoctoral Internship, 2019-2020
  • Harvard Medical School/McLean Hospital, Postdoctoral Clinical Fellowship, 2020-2021

Areas of Expertise

OCD, anxiety disorders, mood disorders, emotion dysregulation, Acceptance and Commitment Therapy (ACT), Dialectical Behavior Therapy (DBT), Cognitive Behavioral Therapy (CBT)


When Dr. Lewis isn’t working, you can find her doing yoga, frolicking in the great outdoors, introverting with her cat, reading, crocheting infinite blankets in front of the TV, or badgering friends and family into playing games.