Our Team – Psychologists & Therapists


Dr. Maria Antoniou

Clinical and Counselling Psychologist

Dr. Maria Antoniou, C.Psych

Dr. Maria Antoniou is a registered Clinical Psychologist working in private practice providing both assessment and treatment services in the areas of counselling and clinical psychology. Dr. Antoniou has a breadth of experience providing assessment and treatment for children, adolescents, adults and families. Dr. Antoniou has a special interest in the treatment of individuals with eating disorders.

Read Clinical and Counselling Psychologist Dr. Maria Antoniou‘s full bio and services.

Dr. Maria Antoniou works at both the Oakville Location and the Hamilton Location


Kyla Baird

Clinical Therapist

Kyla Baird, M.A., Ph.D. Candidate

Kyla Baird, M.A., is a Ph.D Candidate in the Clinical Developmental Psychology program at York University in Toronto. She works with children, adolescents and families and has a breadth of experience in comprehensive psychological assessments, individual, group and family-based therapies.

She has interests and experience in working with children and youth with anxiety and mood disorders, Autism Spectrum Disorder, self-esteem difficulties, Eating Disorders and behaviour problems. Kyla incorporates elements of interpersonal therapy, Cognitive Behaviour Therapy and Dialectical Behaviour Therapy in treatment. She has a special interest in the treatment of eating disorders and uses Family-Based Therapy as the primary intervention.

Kyla has received professional training and has worked in diverse settings including; the outpatient, inpatient and day treatment Eating Disorder programs at the Hospital for Sick Children, the Reach Out Centre for Kids in Oakville, the York University Psychology Clinic, and the Hamilton-Wentworth District School Board.

Kyla provides a warm, non-judgmental and safe space for all clients. She utilizes a collaborative approach to assure clients and families feel supported throughout treatment.

Kyla Baird works at both the Oakville Location and the Hamilton Location


Dr. Stacey Beach (Supervised Practice)

Clinical and Counselling Psychologist

Dr. Stacey Beach, Psy.D (Supervised Practice)

Dr. Stacey Beach is a Psychologist who completed her doctoral degree in Clinical Psychology through Adler University in Chicago, Illinois. She previously earned a Master’s degree in Clinical Psychology from Edinboro University of Pennsylvania, and a Bachelor’s degree (honors) in Psychology from King’s University College at the University of Western, Ontario.

At The Therapy Centre Dr. Beach provides assessment and treatment services to adults. She works with a variety of mental health concerns, including depression, anxiety, relationship issues, grief and loss, stress and anger management and trauma. She has a particular interest in eating disorders which was the topic area for both her master’s-level thesis and doctoral dissertation. Dr. Beach also works with the Workplace Safety and Insurance Board (WSIB), individuals who have been in motor vehicle accidents (MVA) and individuals on short and long-term disability.

Dr. Beach has previously provided therapy and assessment services to children, adolescents, and adults in a variety of settings including clinical and forensic private practice, urban and rural community mental health centres, correctional settings, and weight management clinics.

Dr. Beach takes an integrative approach that is tailored to the client’s personality and needs, while always placing an emphasis on the collaboration and working relationship between the client and therapist.

Dr. Beach is a member of the College of Psychologists of Ontario and the Canadian Psychological Association.

Dr. Stacey Beach works at both the Oakville Location and the Hamilton Location


Mary Cook

Therapist

Mary Cook, B.Sc., M.Ed.

Mary Cook received her Master’s Degree in Counselling Psychology from the University of Toronto. Mary offers strategies from both the Emotion Focused Therapy (EFT) and Cognitive Behavioural Therapy (CBT) models with a goal to helping her clients achieve their goals and regain a sense of well-being and balance in their lives.  She enjoys working with all ages, helping children, adolescents and adults develop effective strategies to manage a variety of difficulties, including mood and anxiety disorders, relationship and work stress, general stress management, self-esteem issues as well as grief and loss. In addition to individual counselling, Mary also has extensive training and experience with Couples Therapy.

Read Therapist Mary Cook‘s full bio and services.

Mary Cook works out of the Oakville Location


Dr. Ilana Davine (Supervised Practice)

Psychologist

Dr. Ilana Davine, Psy. D (Supervised Practice)

Dr. Ilana Davine is a psychologist who completed her Doctor of Psychology (Psy.D) at the Adler University in Chicago, Illinois. At The Therapy Centre, she provides assessment and treatment services to both adolescents and adults.  Dr. Davine’s clinical experiences and interests involve treating individuals presenting with a variety of concerns, including mood and anxiety disorders, issues with self-esteem, self-harm behaviours, as well as LGBTQ+ mental health and issues related to sexual and gender identity. Dr. Davine completed her doctoral dissertation in the area of addictions and has specialized training in treating individuals with substance use disorders.

Read Psychologist Dr. Ilana Davine‘s full bio and services.

Dr. Ilana Davine works at both the Oakville Location and the Hamilton Location


Dr. Jenn Deffendall

Clinical and Rehabilitation Psychologist

Dr. Jenn Deffendall, C.Psych

Dr. Jenn Deffendall is a registered Psychologist who received her Ph.D. from the University of Central Florida.  She currently works in private practice providing comprehensive assessment and treatment services in the areas of clinical and rehabilitation psychology.  Dr. Deffendall has extensive training and experience working with a range of problems including depression, anxiety, post-traumatic stress, health-related issues including chronic pain, and addictions (alcohol, tobacco, cannabis, and other substances). She primarily works within a Cognitive Behavioural Therapy (CBT) framework, with the ability to integrate elements of specialized treatments (such as Dialectical Behaviour Therapy/DBT, Motivational Interviewing/MI) as needed to ensure treatment is effective.

Read Psychologist Dr. Jenn Deffendall‘s full bio and services.

Dr. Jenn Deffendall works out of the Oakville Location


Ann Gelsheimer

Clinical and School Psychological Associate

Ann Gelsheimer, M.Ed., D.T.S., M.A.

Ann is a registered Psychological Associate with the College of Psychologists of Ontario. She has completed two Master’s degrees in psychology (Counselling and Clinical Psychology), and all requirements but her dissertation for a PhD in Clinical Psychology at Fielding Graduate University. Ann is currently working in private practice providing assessment and treatment in the areas of clinical and school psychology for children, adolescents, and adults.  Ann has extensive experience providing comprehensive psychoeducational assessments for children, teens, and also adults attending post-secondary education. She also offers psychovocational assessments for teens and adults who are seeking a new career path.  Ann has specialized training and experience in the areas of learning difficulties, attention problems, recovery from trauma, mild to moderate addictions, grief and loss, supporting persons with cancer and their caregivers, and responding to spiritual concerns as a part of psychological treatment (when requested by clients). She welcomes working with persons of diverse cultures, spiritual or religious traditions, and sexual orientations.

Read Ann Gelsheimer‘s full bio and services.

Ann Gelsheimer works at both the Oakville Location and the Hamilton Location


Dr. Mary Lees

Clinical Psychologist

Dr. Mary Lees, C.Psych

Dr. Mary Lees is a registered clinical psychologist who received her Ph.D. from the University of Western Ontario. She completed her early training in London, Ontario at University Hospital, London Psychiatric Hospital, Victoria Hospital, St. Joseph’s Hospital and Children’s Psychiatric Research Institute

From 1994-2015, Dr. Lees was a staff psychologist at Credit Valley Hospital, Mississauga, where she worked in Inpatient and Outpatient Mental Health, Maternal/Child Care, Child and Adolescent Services, the Anxiety Disorders Program, and the Eating Disorders Program. She has particular expertise in the area of anxiety disorders and eating disorders and worked in Credit Valley Hospital’s adult outpatient and intensive, Inpatient and Day Hospital Eating Disorders Programs from 2001-2015. Dr. Lees has extensive experience with Cognitive Behavioural Therapy, but has also had training in other therapeutic models, including Dialectical Behaviour Therapy. In 2015, she completed a year-long certification in Positive Psychology at the Whole Being Institute in Massachusetts. She has since expanded her work to include a focus on well-being and the assessment and application of human strengths. She also offers services in the areas of stress management, work adjustment, mood disorders, relationship issues and behavioural issues.

Prior to joining The Therapy Centre, Dr. Lees worked in private practice in Mississauga for 17 years. She has a strong interest in clinical and community education and has run workshops on eating disorders and positive psychology in both hospital and community settings.

Dr. Lees is a member of the College of Psychologists of Ontario, the Canadian Psychological Association, and the Canadian Positive Psychology Association.

Dr. Mary Lees works at the Oakville Location.


Dr. Marla McGregor

Clinical and Rehabilitation Psychologist

Dr. Marla McGregor, C.Psych

Dr. Marla McGregor is a registered Psychologist who received her Ph.D. from the University of Toronto (OISE/UT). She currently works in private practice providing both assessment and treatment services in the areas of counselling, clinical and rehabilitation psychology.  Dr. McGregor has a broad base of training and experience working with mood and anxiety disorders, relationship difficulties, self-esteem, anger and stress management. She also has extensive experience assessing and treating individuals who have been involved in motor vehicle accidents and are struggling with issues such as chronic pain, phobias, post-traumatic stress disorder, depression and other interpersonal problems. She also works with individuals who are on short or long disability from their place of employment, working with insurance companies and human resources to help facilitate a successful and sustainable return to work.

Read Clinical and Rehabilitation Psychologist Dr. Marla McGregor‘s full bio and services.

Dr. Marla McGregor works at both the Oakville Location and the Hamilton Location


Katarina O'Donnell

Psychologist

Katarina O’Donnell, M.C., C.Psych

Katarina is a registered Psychologist with the College of Psychologists of Ontario and a member of the Ontario Psychological Association. She currently works in private practice providing treatment services to adults. Katarina’s professional background includes a Master’s Degree in Counselling Psychology. In the past, Katarina has worked with young adults in a university counselling centre and adults of various ages in family physician clinics. Katarina works within a framework that incorporates Cognitive Behavioural Therapy (CBT) and Solution-Focused Therapy (SFT). Katarina has worked with adults to resolve concerns including depression, anxiety, stress management, relationship issues, emotional regulation, and life transitions.

Katarina O’Donnell works out of the Oakville Location


Dr. Susan Sprokay

Clinical Therapist

Dr. Susan Sprokay, Psy.D

Dr. Susan Sprokay is a clinical therapist who completed her Doctor of Psychology (Psy.D) at Pepperdine University in Los Angeles, California. At The Therapy Centre, she provides assessment and treatment services to adults in the context of a genuine and compassionate therapist-client relationship.

Dr. Sprokay’s clinical experiences and interests involve treating individuals presenting with a variety of concerns, including mood and anxiety disorders, adjusting to life changes, coping with grief and loss, and helping her clients increase their understanding of the way they engage with the world and with themselves. Dr. Sprokay draws on her training in contemporary psychoanalytic psychotherapy techniques, incorporating humanistic and cognitive-behavioural techniques to best support positive changes in her clients’ lives.

Dr. Sprokay completed her post-doctoral training at UCLA Medical Center in Los Angeles. She has focused both her clinical and research work on aging, risk for Alzheimer’s disease, caregiver burden, and memory training. Dr. Sprokay provides training sessions to help individuals learn strategies to improve their memory and overall cognitive health.

Dr. Sprokay relocated from California to Ontario in 2017 and is in the process of registering as a psychologist with the College of Psychologists of Ontario. She practiced as a licensed psychologist in California, providing assessment and treatment interventions to adults of all ages.

Dr. Susan Sprokay works out of the Oakville Location


Jackie Tapper-Atkinson

Therapist

Jackie Tapper-Atkinson, M.S.S., R.S.W.

Jackie Tapper-Atkinson has been in private practice in Oakville since 2006. She has over 15 years of experience in providing individual, family and group therapy for teens and adults, with extensive experience in treating depression, anxiety and relationship issues. She also has specialized training in treating body image and eating disorders. Jackie has particular interest in the application of Cognitive Behavioural Therapy (CBT) and Emotion Focused Therapy (EFT) to the treatment of eating disorders, and a range of anxiety and mood disorders. As well, she has been working on the integration of the Family-Based approach and EFT to the treatment of adolescents with eating disorders.

Read Therapist Jackie Tapper-Atkinson‘s full bio and services.

Jackie Tapper-Atkinson works out of the Oakville Location


Dr. Brenda Wiley (Supervised Practice)

Psychologist

Dr. Brenda Wiley, Ph.D. (Supervised Practice)

Dr. Brenda Wiley is a psychologist who completed her Masters of Education and Doctorate in School Psychology (Ph.D.) at Texas A&M University in College Station, Texas. At The Therapy Centre, she provides assessment and treatment services to children, adolescents, and families.

Dr. Wiley’s clinical experiences and interests involve treating individuals presenting with a variety of concerns, including mood and anxiety disorders, trauma, and adjustment disorders. Brenda works primarily from a Cognitive Behavioral Therapy (CBT) framework, while integrating other therapeutic elements, such as Interpersonal Process Therapy (IPT) and Structural Family Therapy as needed. Dr. Wiley’s interest in the influence of the familial unit is related to her own doctoral dissertation on the influences of parental involvement on academic outcomes.

Dr. Wiley’s previous clinical experiences include working in community mental health, school, and hospital settings providing assessment and treatment services to children, adolescents, and their families for mood, anxiety, and trauma-related disorders. She recently completed her doctoral internship at Providence St. John’s Child and Family Development Center in Santa Monica, California.

Dr. Wiley is a member of the College of Psychologists of Ontario and the Ontario Psychological Association.

Dr. Brenda Wiley works at both the Oakville Location and the Hamilton Location