Jassy Casella Timberlake, M.Ed., LMFT, CST

Director and Founder, Northampton Sex Therapy Associates, LLC

Pronouns: she/her/hers

With all my experience, both professionally and personally, I am struck by Jassy’s unique ability to balance challenge and support; to be fully present and compassionate while encouraging deep reflection and soul searching; to guide without directing. She very naturally creates an atmosphere of safety where even the most painful emotions or awkward issues can be touched, explored, penetrated…perhaps just spoken for the first time. She has an uncanny ability to strip through distractions and diversions to elicit the essential truth.

–R.P., Melrose, MA

Jassy began her career in sex therapy as an individual in private practice. As her practice rapidly grew, she realized there was an overwhelming need for certified sex therapists in the region. She founded NSTA to support people seeking sex therapy in the Pioneer Valley, fueled by her passions for social justice and spreading body love—and self-acceptance—with a desire to educate people about sex and bodies.

Jassy feels strongly about the collaborative nature of her team and, through this lens, the benefit it brings not only to the clinicians but also to their clients as they learn, heal, and grow into the sexual life of their choice.

Jassy is Welsh, born in Swansea, South Wales, UK. She moved to the United States in 1984. She has a passionate interest in social justice and sustainable communities. Jassy is devoted to her racially diverse family, and spends as much quality time with her loved ones and her chosen family as she can.

Jassy is licensed with the Commonwealth of Massachusetts as a marriage and family therapist, Lic. #1259, and her credentials can be verified with The Board of Registration of Allied Mental Health Providers.

Cambridge College, Cambridge, MA, Masters level clinician with an M.Ed. in Counseling Psychology/Marriage and Family Therapy

AASECT, Board Certified Sex Therapist
AASECT, Approved Supervisor of Sex Therapy
Gottman Method Couples Therapy, Levels 1 and 2
Planned Parenthood League of Massachusetts, Certified Sexuality Educator

Professional Memberships:
American Association of Marriage and Family Therapy, Clinical Member
American Association of Sex Educators, Counselors and Therapists, Approved Supervisor of Sex Therapy
American Association of Sex Educators, Counselors and Therapists, Certified Member
World Professional Association for Transgender Health, Member
Association for Size Diversity and Health, Member

See Jassy Casella Timberlake on WWLP-22 News’ weekday lifestyle program Mass Appeal, talking about Tips for Improving Your Sex Life!

Jassy Casella Timberlake has the critical skills of a trained professional. This entails taking a specific and detailed medical and psychological history of her clients that she keeps at her fingertips throughout each session and refers to them as needed. This professionalism is perfectly balanced by her empathy for her clients; it is palpable, and is an important part of her skills. As a client, I was never in doubt whether Jassy knew what I was feeling. Her skills in directing her clients through the minefields of their therapy are evident as she guides them in careful steps. She is flexible in her treatments, and has an extensive palette of therapies to draw from, none of which she relies on exclusively. This allows her a depth and flexibility of treatment that bodes well for her clients' progress. Her language and directions are always crystal clear, as are her boundaries as a therapist. She keeps her promises and guides her clients gently, yet firmly.

–T.B., Jamaica Plain, MA

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