Clinical Team

Gwen Tuttle, MSW, LCSW
Clinical Director

Gwendolyne is a Licensed Clinical Social Worker currently completing residency in the Doctor of Social Work program at University of Pennsylvania. Gwen is a certified Mentalization Based Therapy Practitioner, having completed advanced training and supervision with Anthony Bateman, MA, FRC Psych and Peter Fonagy, PhD through the Anna Freud Centre, and with Lois Choi Kain, MEd, MD and Brandon Unruh, MD at McLean Hospital. She is currently pursuing certification as a Mentalization Based Therapy Supervisor through the Anna Freud Centre. Gwendolyne specializes in treating personality disorders with an emphasis on personality organization, and systems of attachment. She enjoys facilitating individual, family, and group therapy for Cornerstones of Maine. Prior to joining Cornerstones in 2017, Gwendolyne served as the Director of Mental Health Services for Catholic Charities Support and Recovery Services, and has provided supervision for new clinicians seeking licensure, and sat on the Board of Directors for Shalom House, Inc. Gwendolyne has also completed practicums in Oncology Social Work at Mercy Oncology, and Outpatient Psychiatry at McGeachey Hall, Maine Medical Center. When not practicing, Gwen has dabbled as a stand-up comedian and ran for Maine House of Representatives in 2012.

Zeus Markos, MSW, LCSW
Psychotherapist, English and Spanish Speaking

Zeus completed his undergraduate degree at the University of Wisconsin-Madison in Psychology and Spanish. After graduation, he focused his professional work on working with individuals who struggle with mental health and substance use disorders. Initially, he worked as a psychiatric care technician at a forensic psychiatric institute in Madison, Wisconsin. He later moved to Maine to study classical Chinese Philosophy and Psychology, eventually deciding to pursue an MSW at the University of Maine. While completing his masters, Zeus benefitted from diverse training opportunities at homeless shelters, substance abuse programs, and outpatient psychotherapy centers. Zeus was also accepted into the Professional Opiate Workforce Response (POWR) Selective Social Work Program; which recruits talented Social Work students into an integrated behavioral health training program.

Zeus has an appreciation for multiple conceptual approaches to psychotherapy with special appreciation for the Jungian perspective. Zeus is a nature-lover, concerned for our planet, enjoys exercise (running, lifting, soccer), loves art, and takes great pleasure in reading, writing, and traveling.

Jackie Roberge, MSW, LCSW

Jackie is a licensed clinical social worker with over a decade of experience in the field of mental health. She obtained her Master’s degree from the University of New England and has since completed extensive training in Acceptance and Commitment Therapy (ACT). Jackie enjoys cultivating a collaborative, client-centered approach to therapy with an emphasis on creating movement towards the values that each individual carries. While she has experience working with individuals across the lifespan, she has spent the past 4 years working exclusively with young adults and their families and finds this population to be the most fulfilling to sit alongside in their journey. In her free time, Jackie can often be found cultivating strength while powerlifting or enjoying her passion of dance at a local studio.

Kristen Gieras, MSW, LCSW

Kristen is a conditionally licensed clinical social worker with over a decade of experience in the mental health and substance use fields.  Kristen has benefitted from clinical training in a variety of prestigious settings such as the McLean Hospital 3 East Dialectical Behavior Therapy Program, Lahey Health and Behavioral Services Program, and Crossroads of Maine.  Kristen practices with a non-judgmental, empathic stance, and values thoughtful collaboration with clients to support their movement through treatment. Kristen is passionate about the outdoors, exploring New England, and coffee.


Amanda Bucci, MS, LCPC-C

Amanda is a Conditionally Licensed Clinical Professional Counselor with almost ten years of experience in the mental health field, working with children, adolescents, adults, and families in multiple capacities. She obtained her Master’s degree from the University of Southern Maine and has completed extensive training and supervision in Emotion-Focused Therapy (EFT) and trauma informed care. Amanda has LGBTQIA+ competency training and years of experience working with the unique mental health needs of folks in this community. Amanda utilizes a humanistic, collaborative, and relational approach to support clients in building awareness and understanding of their internal experience, in order to facilitate sustainable change and help clients move toward authentic and fulfilled living.  In her spare time, Amanda enjoys singing, writing, riding her bike, and exploring new places.

Elliott Day, MS, LCPC

Elliott Day is an experienced and dedicated relational therapist with a strong background in Young Adult therapeutic programming. Since 2015, Elliott has held various roles working with Young Adults, including direct care, outreach and admissions, and therapeutic wilderness field guiding. He completed his Master of Science in Counseling from the University of Southern Maine in 2022 and, prior to joining the Cornerstones team, worked with many families as a Lead Therapist at a hybrid Wilderness/Residential treatment program.


Taking a client-centered approach, Elliott creates a safe and collaborative space for therapeutic work. He incorporates third-wave CBT approaches, Motivational Interviewing, and mind-body techniques into his practice. Influenced by Existential Psychotherapy and Depth Psychology, Elliott recognizes the transformative power of exploring unconscious processes for personal growth.


Beyond his professional commitments, Elliott enjoys spending time with friends and family, skateboarding, snowboarding, and immersing himself in the natural world. He also has a passion for reading and writing poetry.

Kielty Turner, LCSW, DSW

Kielty is a Licensed Clinical Social Worker with experience in community mental health, higher education and substance use disorder treatment and prevention.  She is passionate about mindfulness-based approaches to mental health promotion and interventions, with training in Dialectical Behavior Therapy (DBT) and Acceptance and Commitment Therapy (ACT).  Kielty particularly focuses on starting where the client is at, together identifying their values and goals to facilitate the changes that they are seeking in their lives.


Kielty has a doctoral degree (DSW) from the University of Pennsylvania’s School of Social Policy and Practice, and Master’s degrees from Adelphi University and Marist College. After practicing in New York, New Hampshire and Pennsylvania, Kielty is happy to call Maine her forever home. In addition to meditation and yoga, she enjoys kayaking, and hiking with her family’s miniature Australian Shepherd named Nellie. 

Megan Roy, LCMHC

Megan Roy is a Licensed Clinical Mental Health Counselor specializing in Polyvagal Informed Therapy – a nervous system approach centering regulation, psychoeducation and trauma-informed healing. Megan has years of experience working with teens and young adults while supporting their family in understanding the complex impacts of trauma, entrenched behavior patterns and relational ruptures. Megan’s rich clinical experience also includes working in the dual systems of school and mental health, offering her a keen understanding of the challenges teens and young adults face today.

Megan is trained in DBT through the DBT Institute, Polyvagal Informed Therapy through the Cape Cod Institute and CAMS-Care Suicide Prevention and Assessment. All of her education, experience and training together has allowed her to create a cohesive therapeutic experience for her clients which is both insightful and actionable. 

Outside of professional hours, Megan enjoys reading, checking out new places to eat, hanging around coffee shops and running along the beach.