Mark GreenMark Green, MD

Addiction Psychiatrist and Founder

“It is such a relief to find a Doctor who actually listens to me, and understands exactly how I felt. For so long, I’ve felt frustrated, starting different medicines, feeling rushed in and out. It is wonderful to be making some real progress in my life at last.”

Mark graduated (UK version of) summa cum laude in Neurobiology and then completed his medical degree at University College London. He came over to NYC for his Psychiatry residency then and Addictions fellowship (Payne Whitney Clinic, New York Presbyterian Hospital, Cornell Medical Center), and later conducted research in the neurobiology of addictions at Rockefeller University. He’s been on Faculty at Cornell (Asst. Prof), Vermont (Asst. Prof), and Harvard (Instructor) Medical Schools. He is dually boarded by the American Board of Psychiatry and Neurology in both general psychiatry and addictions.

Since graduating in 1999, Mark has set up & run addiction treatment programs (NYC, Vermont), directed supreme evidence-based dual disorders programs, overhauled national addictions and pain programs (Kaiser Permanente, Colorado) and treated thousands of patients.

Mark is an expert psychotherapist. He is trained in many modalities: psychoanalytic, cognitive behavioral, solution-focused, motivational, hypnosis, and others. He’s currently receiving training in Accelerated Experiential Dynamic Psychotherapy. Dr. Green’s therapy approach is relational, pragmatic, structured, direct, and emotionally vivid.

He is an expert psychopharmacologist, remaining cutting edge without taking undue risks with you, using what’s tried and tested, and imaginatively minimizing side effects. He often helps people get off med cocktails they’ve been stuck on for years. He sees medications as facilitating psychotherapeutic change.

He has written many articles in neurobiology, psychiatry and addictions, and lectured at major conferences nationwide.

Click here to read his resume


Sean McGlew, Psy.D, L.P.

Clinical Psychologist, Trauma Specialist. 

Sean McGlew, Psy.D., is a licensed clinical psychologist with a dual specialization in traumatic stress and addiction treatment. Sean’s approach to therapy is collaborative and strengths-based, providing the client with concrete skills to manage distress as well as a space to explore underlying barriers to wellness from addiction and/or mental illness. Sean believes in creativity in therapy as well as recovery so he will work with you to individualize your care to your needs and goals. A strong focus on self-efficacy (the belief that ‘I am able’), and values-directed decision making are the foundation to Sean’s treatment, which helps build the confidence needed to make changes to your life.

Sean is trained in multiple models of treatment including Acceptance Commitment Therapy (ACT),  Dialectical Behavioral Therapy (DBT), Structural Family Systems, 12 Steps model of recovery, harm-reduction, habit reversal training, and motivational enhancement approaches to treatment. Sean believes the best approach to treatment is through evidence-based interventions.

Sean completed his clinical psychology internship and postdoc at Hazelden Betty Ford Foundation, working specifically with adolescents and young adults struggling with both addiction and a range of mental health disorders. Sean received his undergraduate degree from the University of New England in Maine and his doctorate with a traumatic stress concentration from Adler University in Chicago. Sean has extensive training and experience in the treatment of traumatic stress, addiction, chronic suicidal ideation and self-harming behaviors, bereavement and grief,  as well as depression, anxiety, eating disorders, and compulsive disorders including trichotillomania and excoriation. Sean has placed special emphasis on treatment of diverse populations, specifically LGBTQ, young women, and people of diverse ethnic backgrounds. He believes that no matter your background or circumstances, everyone deserves and can obtain recovery.

Drew Welch, RN

Registered Nurse, Family Therapist

“He’s the best nurse I ever worked with. We worked together for 6 years at WestBridge and I am really lucky he agreed to work with me at Psych Garden. He’s thorough, conscientious, caring, humble, courageous, honest and wicked smart.”

Drew Welch is a licensed registered nurse & therapist with over 20 years of experience working with individuals with co-occurring disorders as well as their families. He has extensive training in evidence-based practices including motivational interviewing, cognitive behavioral therapies, family therapy, vocational rehabilitation and integrated dual disorders treatment and has supervised and taught others these skills.

Drew was at WestBridge Community Services for 7 years as their nurse care manager, team leader and national wellness coordinator. Prior to that he was the Nurse Manager for the Co-occurring Disorders Unit at Bournewood Hospital.

Drew has more than 20 years of sobriety. He understands how impossible recovery can seem and that no single path works for all. He knows the importance of education, support and hope. These days he uses all his training, experience and passion to help others feel freer, prouder and more connected. Sometimes 12 step approaches help, sometimes CBT, sometimes a focus on exercise and diet (Drew recently completed his first triathlon). Side-by-side coaching can be invaluable to rebuild the self-confidence withered by addictions and psychiatric illness; so he’ll do that too.

Halie Parmalee, LICSW

Psychotherapist (Individual)

Halie Parmalee, LICSW comes at addictions and general therapy through her deep training in trauma models and working with young people in her anxiety situations. This enables her to engage with people others may struggle with, work on emotions that underpin many escape behaviors and teach anxiety management and effective coping.

Halie received her Master’s in Social Work from Boston College and, before coming to Psych Garden, worked Program Manager at the Children’s Advocacy Center of Suffolk County, specializing in evidence based trauma treatment, DBT skills, and mindfulness-based approaches.

Halie is a strong and sharp-focused clinician with a gentle touch and infectious curiosity.


Anne Livermore, LICSW

Psychotherapist (Individual)

Annie has experience as an individual therapist, specializing in substance use and trauma, and working with members of the LGBTQ+ community. Before Psych Garden, Annie was working with people with serious mental illness, addictions and neuro-divergence.

Annie is a warm and focused therapist. Patients say she is clear strategic, encouraging them to explore the areas that will make the difference, even if it’s painful. She is trained in DBT, Motivational Interviewing and CBT. She encourages emergence of strengths and in self care, in healing our bodies and souls alongside our minds.

She received her MSW from the Boston University School of Social Work with a dual focus in Behavioral Health and Family Therapy and her undergraduate education at Wellesley College where she studied English and Women’s and Gender Studies. This informs her clinical work where she considers the impact of social constructs on identity formation.

 Percy Ballard, MD

Psychiatrist and Psychotherapist

Percy Ballard, MD is a psychiatrist who graduated from Stanford University and then Harvard Medical School and completed general psychiatry residency training at Harvard Medical School/Cambridge Health Alliance. He is an expert of psychopharmacology and therapy and has, for 10 years, worked in LGBTQ community programs, private practice and therapy collaboratives.

He is Level 1, 2 and 3 trained in Internal Family Systems (IFS) therapy, and uses it regularly in conjunction with medication management. He regularly teaches and presents on the topic of IFS, including several workshops with the founding developer of the model Richard Schwartz, Ph.D.  He develops and co-teaches workshops on implicit bias, and co-hosts a YouTube channel on the psychology and spirituality of love and dating. He is LGBTQ friendly, Kink friendly and Polyamory friendly.

Danielle Green, LICSW

Psychotherapy Supervisor (Couples and Family)

Danielle received her MSW from Columbia University in 1993 and completed 5 years of further specialist training in couples and family therapy at the Ackerman Institute for the Family, in New York City. She worked and taught at Cornell Medical Center for 10 years before relocating to Boston to serve as Clinical and Training Director of the Couple and Family Therapy Program, at the Cambridge Health Alliance, Harvard Medical School. There, she trained social workers, psychiatrists and psychologists, and taught throughout the Harvard system. Danielle was certified as an EFT (Emotionally Focused Therapy) therapist in 2010 and as a certified supervisor in 2011. She has studied AEDP and trauma work with Janina Fisher and has recently embarked on studying Peter Levine’s work on Somatic Experiencing. Her areas of specialty are distressed relationships, and relational crises such as affairs.  Danielle helps couples develop skills to restore trust, communicate and express feelings effectively, understand and resolve differences to create a secure and lasting bond with those who matter the most. Danielle also offers supervision to advanced practitioners. Danielle has been married for 20 years and has three children; so she is able to relate to the ups and downs of long-term relationships and parenting.  Danielle also founded and works at the New England Center for Couples and Family.


Adam Henderson, MD

Psychiatrist and Psychotherapist

Adam Henderson, MD studied at Brown University where he completed his undergraduate and medical degrees. While a medical student at Brown, Adam became interested in helping those struggling with their mental health and substance use while doing research in neuroscience. Adam noticed how people are extremely resilient when given the right tools to thrive – skills, caring, support – and as a psychiatrist, he aspires to give his patients all the tools he can.

Adam completed his residency at the Harvard University-affiliated Massachusetts General Hospital and McLean Hospital Psychiatry Residency program where he was outpatient chief resident and hold a position as attending at McLean Hospital. He has worked extensively in the various therapeutic modalities including psychodynamic therapy, Cognitive Behavioral Therapy (CBT), and Mentalization Based Therapy (MBT). Adam has practiced psychiatry in a variety of settings ranging from the outpatient setting, to the Emergency Room, to the inpatient units at MGH and McLean and gained experience working with a variety of different people at different points in their recovery. Adam believes that the most effective treatments combine the judicious use of medication, psychotherapy to help patients understand and overcome the sources of their suffering, and lifestyle modification through incorporating physical activity, socialization, nutrition, and connection to nature and/or the spiritual. When coming up with a treatment plan, Adam’s philosophy is to help people realize their best potential self. Adam deeply appreciates that there is not a one size fits all approach to healing and is dedicated to exploring with people, through a collaborative effort, treatment plans that are realistic for them.

Kerri KuklentzKerri Kuklentz, MS CRC CPRP, NASM-CPT

Field Coach/ Fitness Coach/ Rehabilitation Specialist

Kerri has more than 10 years experience as a field coach for persons with mental health challenges and addictions, first at BU Center for Psychiatric Rehabilitation, then at Westbridge Community Services. She is incredibly warm, and supportive; and has an uncanny ability to inspire people through identifying values, goals, and courage to pursue work, education, social connection, and healthy living. She is a certified personal trainer and believes exercise is a key path to building self-esteem, gaining acceptance with one’s body and feelings, and attaining balance in life.

Robert Bonazoli, LICSW

Leader, Ketamine Assisted Psychotherapy Program

Robert earned his MSW from Boston College and completed his post-graduate psychotherapy training in fellowships at Harvard Medical School and the Boston Institute for Psychotherapy. He has trained deeply in Internal Family Systems therapy (IFS), in which he is fully certified, EMDR, psychodynamic psychotherapy, Cognitive Behavioral Therapy (CBT), and Dialectical Behavioral Therapy (DBT). He has served as a Senior Lecturer at Northeastern University and presently serves as an Instructor at the Boston College Graduate School of Social Work where he teaches courses in Adult Psychological Trauma and Cognitive Behavioral Therapy.

He has been a Mindfulness Based Stress Reduction (MBSR) instructor since 2008, completing his training at the UMASS Medical School Center for Mindfulness. He has practiced and studied Buddhist ethics, psychology, and meditation for over twenty years. He has sat over 250 days on silent meditation retreat over the past 10 years in the Theravadan vipassana, Rinzai Zen, Vajrayana, and non-dual traditions, and is presently a student of Vajrayana Buddhist meditation and Mahamudra under Yongey Mingyur Rinpoche.

Bringing together his training in interpersonal psychotherapy and mindfulness & meditation, Robert completed training as a psychedelic psychotherapist with the Multidisciplinary Association for Psychedelic Studies (MAPS) in MDMA Assisted Psychotherapy for PTSD under Michael and Annie Mithoefer, and in Ketamine Assisted Psychotherapy (KAP) with Phil Wolfson and Julane Andries at the Ketamine Training Center.

Robert’s approach to therapy is grounded in the belief that much of human suffering stems from a separateness, a rupture, or an incohesiveness between the core dimensions of our lives: psychological, interpersonal, physical, and spiritual. He believes that powerful growth and healing can be rooted in the work of striving to integrate or re-integrate, the unique and complicated combination of elements making up these dimensions within each person’s life. He believes that psychedelic therapies such as Ketamine Assisted Psychotherapy, combining the powerful psychological and emotional access that such medicines can allow with an attuned and expert interpersonal psychotherapy can help facilitate such integration, often much faster and more powerfully than with either modality on its own. He is committed to creating trusting, warm, and accepting relationships with his clients in order to effectively enter such important and personal work together.

Oriana Federico, LICSW

Psychotherapist, CRAFT Therapist.

Oriana is a LICSW with a Master’s in Social Work from Columbia University who brings a great deal of experience treating young adults with a range of substance use and mental health disorder diagnoses using evidence-based treatment modalities including CBT, mindfulness, motivational interviewing, and harm reduction. She also has extensive experience providing therapy and coaching using the CRAFT model (Community Reinforcement and Family Training) to assist family members and concerned significant others impacted by a loved one’s substance use.

Oriana has served as the Clinical Director at a local collegiate recovery program where she provided both individual and group therapy using elements of CBT, DBT and motivational interviewing. She has also worked and trained at Massachusetts General Hospital’s Addiction Recovery Management Services, a substance use disorder and Dual Diagnosis program for young adults and their families, providing both short and long term individual and group therapy, extensive psychosocial evaluations, and coaching for parents.

Oriana’s approach is client-centered, supportive, and strength-based. She believes that with the help of a strong therapeutic alliance, individuals are able to explore the underlying beliefs and narratives that keep them in behavioral patterns and form new perspectives.


Cassandra DeQuevedo, LMHC

Psychotherapist – Individual and Couples. 

Cassandra joined Psych Garden in 2021 and comes with over 10 years of experience working with students and staff at the University of Massachusetts both as therapist and as Diversity & Inclusion Coordinator, and at Walden Behavioral Health, where she specialized in treating eating disorders, mood disorders and anxiety. Over the years Cassandra saw that relational issues often lay at the heart  of many presenting issues and that healing connections and building secure attachments was an effective, but often missing, treatment approach. She is trained in Emotionally Focused Therapy for Couples (, and is in the process of attaining advanced certification. Her style is warm, open, and curious – both following and leading the treatment. She enjoys working with clients who are experiencing life transitions, clients who struggle with drugs and alcohol, eating disorders, LGBTQ+ issues, grief & loss, trauma healing, and race and identity concerns.

Allison Russell

Office Manager

Allison graduated from the University of Massachusetts Boston with a degree in Exercise Health Science. She also has 20 years work experience in Psychosocial Rehabilitation. It is her belief that exercise plays an important and positive role in the balance of mental and physical health.

She swims most days and having grown up on the San Francisco Bay loves all water sports. Allison is married with one child in University and she is a Transgender and Gender Non-conforming ally.



Miles received his initial training on a farm in rural OK before an internship in Belmont and further training at the Psych Garden. We are honored that he has chosen to continue his studies with us and contribute his warmth, gentleness and insights. He is a hypoallergenic poodle-cavalier mix. Like our other staff, he doesn’t bark or bite.