Board Certified Psychiatrist & Psychologist

About Us
Board Certified Psychiatrist. Board Certified Child & Adolescent Psychiatrist

Nicolas Sikaczowski, DO

Board Certified Psychiatrist

Board Certified Child & Adolescent Psychiatrist

Dr. Nicolas Sikaczowski is an ABPN Dual Board Certified Psychiatrist and Child & Adolescent Psychiatrist.  He is the founder of Peace Behavioral Health. He sees patients in-person and via telehealth from Saco/Biddeford Maine throughout the year and seasonally from our Miami location. Dr. Sikaczowski is licensed in both Florida and Maine. He completed his Child and Adolescent Psychiatry Fellowship at University of Miami, where he currently serves as a Voluntary Assistant Professor of Psychiatry and Behavioral Sciences, providing therapy supervision and mentorship to Psychiatrists pursuing their Child and Adolescent Psychiatry Fellowship.  He completed his General Psychiatry Residency in South Florida after completing medical school at Nova Southeastern University in Fort Lauderdale, FL.  Prior to medical school, Dr. Sikaczowski completed premedical training at Northwestern University and Harvard University after receiving his B.A in Commercial Music from Millikin University with a focus on classical guitar.  He specializes in treating child, adolescent, and adult patients with conditions including ADHD, Anxiety Disorders, Depressive Disorders, Bipolar Disorder, OCD, Eating Disorders, and Schizophrenia.

Ahley Shaw

Ashley Shaw, PhD

Licensed Clinical Psychologist

Dr. Ashley Shaw has extensive clinical training in cognitive-behavioral (CBT) and dialectical behavioral (DBT) treatments for adolescents and adults, with a special emphasis on emotional disorders (including obsessive-compulsive disorder, anxiety, depression, and hoarding). Dr. Shaw is licensed in both Florida and Maine. She received her B.A. from University of North Carolina at Chapel Hill, and went on to receive her Ph.D. in Clinical Psychology in the adult division from University of Miami. She completed her clinical psychology internship training in the cognitive-behavior therapy elective at Massachusetts General Hospital/Harvard Medical School. She completed a two-year postdoctoral fellowship in the child division at the University of Miami. Between 2019 and 2022, she was a Clinical Assistant Professor at Florida International University, where she was the Clinical Director of the Mental Health Interventions and Technology (MINT) Anxiety Program and founded and directed the MINT Dialectical Behavior Therapy for Adolescents Program. From Fall, 2022 to Spring, 2023, Dr. Shaw was a Visiting Assistant Professor at Bowdoin College. Dr. Shaw will be starting as a tenure-track Assistant Professor at University of New England in August, 2023. Dr. Shaw is passionate about helping adolescents and adults who struggle with strong emotions, such as anxiety and depression. She strives to help her clients gain self-efficacy about their ability to cope with strong emotions and stressors.

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Dr. Dennis Valerstain, MD Spanish Speaking Psychiatrist, Portuguese Speaking Psychiatrist

Dennis Valerstain, MD

Board Certified Psychiatrist


Dr. Dennis Valerstain sees patients in-person at our Miami and Aventura offices and throughout Florida via telehealth. Dr. Valerstain completed his general Psychiatry residency at University of Miami in Miami, FL and completed medical school at Northwestern Feinberg School of Medicine in Chicago, IL. Prior to medical school, Dr. Valerstain completed premedical training at Emory University in Atlanta, GA where he also obtained a BS in Chemistry and a minor in Italian Studies. He was born in Rio de Janeiro, Brazil and grew up in Miami, FL. He speaks English, Portuguese, Spanish, and some Hebrew. He specializes in treating adolescent and adult patients with conditions including ADHD, Anxiety Disorders, Depressive Disorders, Bipolar Disorder, OCD, and Schizophrenia

Alixandra Buckvar, LCSW Experiences Maine therapist in EMDR, Trauma therapy, Child Therapy, CBT, DBT

Alixandra Buckvar, MSW, LCSW

Licensed Clinical Social Worker

Alixandra Buckvar (Alix) is a Licensed Clinical Social Worker specializing in children, adolescents and young adults. With 10+ years as a therapist for children and adults, she has worked extensively with teens and adults who have experienced trauma and mental health challenges, including depression, anxiety, abuse/neglect, sexual violence, drug use, self-harm, and suicidal ideation.  Alix’s approach is rooted in empathy, mindfulness, and evidence-based practices, allowing her to create a safe and supportive environment where young people can explore their emotions and develop resilience.  Alix utilizes a holistic approach integrating techniques such as mindfulness and the use of creative arts to complement traditional therapeutic methods, such as, play therapy techniques, sandtray, CBT, DBT, and EMDR. Her approach has been proven effective in helping patients achieve greater self-awareness and emotional stability.  One of Alix’s core strengths is creating strong, trusting relationships with her patients, enabling them to feel heard, understood and supported. She works collaboratively with patients and caregivers in creating individualized treatment plans that address their unique circumstances and goals that are important to them. Alix is currently accepting new patients and has immediate availability for in-person (at our Saco, ME Office) or telehealth therapy visits.


What Our Patients Say and Community Feedback

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About Us

“Absolutely the most liberating experience i’ve ever had with a Psychiatrist , I felt heard, I felt seen, I have seen countless of Psychiatrists and I had never truly felt like someone was actually listening, analyzing and trying to ACTUALLY find a solution rather than just pick what was the easiest pick medication wise . Highly recommend 10/10”

- G.S.

“Dr. Sikaczowski was great! He takes time to understand my issues, which I really appreciate.  Super great vibe!”

- H. Chu

Dr. Shaw was the ideal therapist for me, as someone close to the mental health field! She delivered evidence-based care with integrity, and our work empowered me to reclaim parts of my life I didn’t think I could! The way we established clear goals and tracked my progress was very helpful, and she brought care and intention to every session. This was the kind of therapy I had been wanting for years!

“I would highly recommend peace behavioral health to anybody in the local Miami area. Dr. Valerstain has been such a good doctor to me. It is very apparent that he cares more than most. That is what every patient needs too! Patience, kindness, and an understanding doctor that doesn’t offer “blanket care” to us since everyone is a unique person. Thank you Dr. Valerstain! Dr. Nick!

- Brittney H.

“Dr Nicolas is an excellent professional, committed to his patients. He’s always there when you need him the most. His patience with teens is amazing and you can see good results with him. We tried with 3 other doctors before him and none came even close to Dr Nicolas.

- Imilseth A.

“Dr. Nic is the single best psychiatrist I‘ve ever had – and I‘ve had a lot lol. He‘s patient, understanding, kind, never judges, and always thinks of a solution or plan.

- Vicky R.