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Our Team


Cornerstones of Maine is the result of a labour of love for our two founders, Josh and Jake. It is independently owned by them and was established on the foundation of their desire to create a young adult transition program that is based on mental health research and experience. Not only are they the founders, they are also part of our core clinical staff.

Clinical Team

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Eric Beaudoin, Psy.D.

Clinical Director

Eric is a licensed psychologist who specializes in the treatment of the young adult population. He has been part of the Cornerstones team since its opening and has become an integral component of the program and its culture. When not working with our young adults at Cornerstones, Eric is providing them with lectures on psychology at the University of New England as an adjunct professor. Eric also has a passion for music and can often be found leading jam sessions on his guitar at our program houses. In his spare time, Eric plays guitar, writes, enjoys technology, and exploring new foodie spots.

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Gwen Tuttle, MSW, LCSW

Clinical Coordinator


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.

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Kerry Bennett, MA, LCPC



Kerry is a Licensed Clinical Professional Counselor with over ten years of clinical experience in the mental health and substance abuse fields. Kerry has served in multiple capacities, most recently as the lead clinician in a juvenile justice facility, where she gained invaluable insight into the needs of our most vulnerable populations. Kerry is passionate about providing individualized, creative, and intentional care. While she is competent in the provision of treatment through multiple evidence-informed modalities, including DBT, TF-CBT, and Motivational Interviewing, she believes that each individual deserves personalized care, and as such, approaches treatment in a manner that is both collaborative and holistic. 

Kerry has specialized training to work with adolescents who are at risk of involvement with the justice system and has taken every opportunity to remain current with trends in adolescent mental health and trauma-informed care. In her spare time, Kerry enjoys spending time outdoors and exploring the wonders of Maine with her close friends and dog, Ben.


Zeus Markos, MSW, LMSW-CC

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, LMSW-CC


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.



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