About Us
Meet the clinicians behind Lindsay O’Neil & Associates and how we support adults, youth, and families in Welland and online across Ontario.
ABOUT US
A Practice Built for Safety, Respect, and Change
Lindsay O’Neil & Associates Trauma and Psychotherapy Services was created to offer steady, supportive care for people navigating trauma, stress, and major life experiences. Our team includes Registered Social Workers and Registered Psychotherapists who work with adults, youth, and families. Sessions may include trauma-focused work such as ITATM and EMDR, or psychotherapy approaches like CBT, DBT, ACT, narrative therapy, and Internal Family Systems. Care is tailored to your goals, your pace, and what feels manageable each week.
ABOUT US
Meet The Team Behind Lindsay O’Neil & Associates
Our clinicians bring different training paths and areas of focus, so clients can find a therapeutic fit that feels grounded and practical. Lindsay O’Neil is the founder and owner. The team also includes Nina Wallace, Holly Keus, and Nicole Guillemette. We support people impacted by anxiety, depression, PTSD, relationship strain, attachment challenges, and complex trauma experiences, including domestic violence, incarceration, abortion, and human trafficking. Appointments are available in Welland and by secure video sessions across Ontario.
Holly Keus
Holly is registered with the College of Registered Psychotherapists (CRPO) and has a Master of Counselling Psychology. She is passionate about helping you and your family achieve your goals and overcome life's challenges. Building a therapeutic relationship and having a good therapeutic fit is the most important aspect of Holly’s work. Throughout your therapeutic journey Holly will work with you to identify the root cause of your concerns and help create a roadmap to empower you to discover how to live your healthiest and most fulfilling life.
Throughout her career as a psychotherapist, Holly has worked with clients with ADHD, Depression, Anxiety, OCD, Postpartum and Perinatal concerns, Interpersonal Relationship concerns, Disordered Eating, and more. She draws from a rich background and training in several evidence-based approaches including: Narrative therapy, DBT, CBT, Internal Family Systems, Psychodynamic, Emotion focused, Person-centred, and Art Therapy Interventions. When utilizing these therapeutic modalities, Holly ensures her work is client centred and focused on empowering you to make the changes that you would like to see in yourself.
Giving you the space to feel comfortable and open enough to discuss the most difficult moments in your life sets the stage for healthy collaboration throughout the therapeutic process. In your initial sessions, your reasons for seeking support, as well as what goals you want to achieve as a result of seeking therapy, will be discussed.
Holly is committed to continuing her professional development through additional training courses. She has experience working with children, adolescents, families, couples, and individuals.
Lindsay O'Neil
With a passion for life and a desire to see others succeed, Lindsay has spent over 20 years in the social work industry. The past 4 years she has immersed herself in a trauma responsive approach, and confidently implements the Trauma and Attachment Treatment model (ITATM) as her main approach to trauma therapy. This approach requires specialized training and incorporates multiple different therapeutic modalities that are helpful in regulating the mind, body, and nervous system. Lindsay has supported clients who have experienced all types of trauma including, CPTSD, childhood abuse, intimate partner violence - including narcissistic abuse, adoption, incarceration, abortion, traumatic death/loss, separation/divorce and everything in between. Lindsay is now committed to a career dedicated to helping others achieve their potential and overcome life’s hurdles by healing hearts and easing minds. She is motivated to work in an environment where individuals and families will find success through healing trauma at a nervous system level. As the founder and owner of Lindsay O'Neil Trauma & Psychotherapy, Lindsay has built a space in the community where individuals who live with the impacts of trauma, have support and space to heal. Lindsay is a registered master of social worker (RMSW), licensed to practice psychotherapy in the community.
Nicole Guillemette-Hayes
Nicole is a fluently bilingual (French/English) Registered Social Worker with over 25 years of experience supporting individuals, youth, and families in mental health and trauma-informed care. She is trained in the Integrative Trauma and Attachment Treatment Model (ITATM), and is passionate about helping people better understand their experiences, reconnect with their strengths, and move toward healing and meaningful change.
Nicole holds a Master of Social Work and has worked across community mental health, crisis services, education, and family law, supporting diverse populations facing complex life challenges. Her broad experience allows her to bring a thoughtful, compassionate perspective to the therapeutic process.
Nicole’s therapeutic approach is warm, collaborative, and trauma-responsive. She strives to create a safe and supportive space where clients feel comfortable sharing their stories and exploring the impacts of trauma on both the mind and nervous system. Nicole believes that healing begins with a strong therapeutic relationship and works alongside clients to build insight, develop coping strategies, and foster resilience.
She integrates several evidence-based approaches into her work, including Acceptance and Commitment Therapy (ACT), Cognitive Behavioural Therapy (CBT), Dialectical Behaviour Therapy (DBT), trauma-responsive therapy, and solution-focused approaches, tailoring treatment to each client’s unique needs and goals.
Nicole has extensive experience supporting individuals experiencing trauma, anxiety, depression, family conflict, and significant life transitions. She understands that reaching out for support can feel difficult and is committed to creating a space where clients feel heard, respected, and supported in their healing journey.
Nicole is currently working with children/youth, adults, and couples.
Nina Wallace
Nina is a registered Social Worker, licensed to practice Psychotherapy in the community. Nina holds a master’s in social work as well as a bachelor’s in social work and brings over 15 years of experience in the field. Her clients often describe her as supportive, calm, and grounded. Nina believes in encouraging growth through compassion and curiosity to help people reach your goals.
Nina is dedicated to creating a safe environment for everyone she works with. She has experience supporting individuals who have experienced trauma, anxiety, depression, and domestic or family violence. Nina’s training in Eye Movement Desensitization and Reprocessing (EMDR), Dialectical Behaviour Therapy (DBT), and her interest in other modalities such as Cognitive Behaviour Therapy (CBT) and talk therapy all inform her approach. Nina’s commitment to ongoing learning and professional development ensures that she stays informed about the latest research and best practices.
Using a collaborative and holistic approach, Nina strives to recognize each person’s unique value and strengths. She will support you in developing strategies to overcome challenges and work toward a more fulfilling life. As a therapist, Nina’s goal is to build a therapeutic relationship that emphasizes your resilience and growth.
It can feel intimidating to open up about your life and struggles to someone new. Nina invites you to share what’s been going on in your life, what’s on your mind, or what’s been bothering you. You’ll have the space to speak openly and explore your thoughts, emotions, and experiences. Helping people is her passion, and she thrives on witnessing positive and lasting changes in the lives of her clients.
ABOUT US
Meet The Team Behind Lindsay O’Neil & Associates
Our clinicians bring different training paths and areas of focus, so clients can find a therapeutic fit that feels grounded and practical. Lindsay O’Neil is the founder and owner. The team also includes Nina Wallace, Holly Keus, and Nicole Guillemette. We support people impacted by anxiety, depression, PTSD, relationship strain, attachment challenges, and complex trauma experiences, including domestic violence, incarceration, abortion, and human trafficking. Appointments are available in Welland and by secure video sessions across Ontario.
FAQS
Common Questions About Therapy
How do I choose the right therapist on your team?
If you are unsure who to book with, contact us with your goals and preferences. We will help you choose an associate who is a good fit.
Do you offer both trauma therapy and general psychotherapy?
Yes. We provide trauma-focused options such as ITATM and EMDR, plus psychotherapy approaches like CBT, DBT, ACT, narrative therapy, and IFS.
Can caregivers or family members book sessions for support?
Yes. Caregiver sessions are available for support, education, and safety planning while you are supporting a loved one in distress.
Where are sessions offered if I am not in Welland?
You can meet with us online through secure video sessions across Ontario. In-person appointments are available at our Welland office.
What should I expect in a first appointment?
The first session focuses on understanding what brings you in, your goals, and what support feels most helpful. You can ask questions and set priorities.










