About Dr. Martinez and Her Team


Dr. Yvonne Martinez, Ph.D., C.Psych.

Dr. Martinez is a registered Clinical and School Psychologist, with the College of Psychologist of Ontario, and she specializes in working with children, adolescents, and their families. 

Currently, Dr. Martinez is the Manager of Psychological Services at Youthdale Treatment Centres, where she manages a team of consulting psychologists, supervises Ph.D-level interns, and provides consultation to the various Youthdale programs/services (Crisis Services, Treatment Residences, Outpatient Services, Day Treatment). Dr. Martinez additionally conducts specialized psychological assessments for children and adolescents with complex mental health problems. In early 2019 she was approached by Best Doctors Canada/Teladoc Health to be an Expert Consultant, reviewing existing psychological diagnoses and treatment plans for children and youth, and providing a second opinion. In January 2020, Dr. Martinez started teaching for Ryerson University's Psychology Department.

Dr. Martinez earned her M.A. (2007) and Ph.D. (2011) from the University of British Columbia (UBC). As part of her training, she successfully completed her doctoral internship program (accredited by the American Psychological Association) in Illinois, with rotations at the Southern Illinois University School of Medicine (St. John's Pavilion and St. John's Children's Hospital), the Hope Institute for Children and Families, and The Autism Program of Illinois. Her training and studies were funded by highly competitive awards and grants, including the Canadian Institutes of Health Research (CIHR) Doctoral Research Award, which is not typically awarded to students/trainees within the social sciences and humanities. Other significant awards included a Four-Year Fellowship, the Dean of Education Scholarship, and a Full Tuition Scholarship from UBC. 

Dr. Martinez has a range of clinical and school-based experiences since moving back to Toronto in 2011, and she has worked at:

-York Region District School Board (Psychologist in the Psychological Services Department)

-York University Psychology Clinic (Adjunct Clinical Faculty Associate/Psychologist providing both clinical supervision to graduate-level students and psychological services to families in the community)

-Surrey Place Centre (Psychologist in the 0-6 Infancy and Early Childhood Program)

-Kinark Child and Family Services (Psychologist in the Central East Autism Program)

She has also published several articles in peer-reviewed journals on the assessment, prevention and treatment of anxiety disorders in school-age children. She has presented at a number of selected refereed conferences across North America, and has taught undergraduate and graduate-level courses on the Assessment of Learning Difficulties, School-Based Intervention Practicum, and Learning, Measurement, and Teaching. 

Last but not least, Dr. Martinez is a mother to two young children, whom she learns from every day. 


Dr. Esther Ko, Ph.D., C. Psych. (Psychological Consultant)

Dr. Ko is a registered Clinical and School Psychologist, with the College of Psychologist of Ontario.   She works with children and adolescents, and their families. 

Dr. Ko completed her Ph.D. in School Psychology from Indiana State University, which was among the first of such programs in the United States. Dr. Ko has provided assessment, therapy, and consultation services in a variety of hospital, nonprofit, school board/university, and private practice settings. She currently works full-time as a Psychologist within the York Region District School Board.

At this practice, Dr. Ko provides the following types of assessments to children and adolescents:

-Psychoeducational (e.g., learning disabilities, attentional disorders, intellectual disabilities)

-Gifted Testing

-Social-Emotional (e.g., depression, anxiety, behavioural disorders)

-Assessments for transition to College/University

Dr. Ko speaks both English and Mandarin. However, assessments are standardized and are conducted in English


Ms. Jovana Seat, M.Ed. (Psychometrist)

Ms. Seat holds a Master of Education in Developmental Psychology and Education, and a Bachelor of Science in Psychology, both from the University of Toronto

Ms. Seat has been working on a number of research studies at the Centre for Addiction and Mental Health (2015-Present) and the University of Toronto (2008-2015) examining child development and psychopathology in childhood and adolescence.  She has experience assessing cognitive, academic, social, emotional, and behavioural functioning in children and youth, using a variety of assessment tools and methods.  Jovana has a strong ability to establish rapport with children and youth (and their families), and empathize with their presenting conditions. 

As a Psychometrist, she works under the supervision of Dr. Martinez, providing a range of assessments.  

Refereed Publications & Conference Presentations



Martinez, Y., Tannock, R., Manassis, K., Garland, E. J., Clark, S., & McInnes, A. (2015). The teachers’ role in the assessment of selective mutism and anxiety disorders.  Canadian Journal of School Psychology, 30(2), 83-101. DOI: 10.1177/0829573514566377.

Miller, L., Martinez, Y., Baker, H., & Shumka, E. (2014). Multiple Informant Agreement of Child, Parent, and Teacher Ratings of Child Anxiety within Community Samples. Canadian Journal of Psychiatry, 59(1), 34-39. DOI: 24444322

Drysdale, M., Martinez, Y., & Thompson, L. (2012). The Effects of Humorous Literature on Emotion: A Pilot Project Comparing Children with Asperger's Syndrome Before and After Neurofeedback Training and Controls. Journal of Neurotherapy: Investigations in Neuromodulation, Neurofeedback and Applied Neuroscience, 16(3), 196-209. DOI: 10.1080/10874208.2012.705758 

Miller, L., Gold, S., Laye-Gindhu, A., Martinez, Y., Yu, C., & Waechtler, V. (2011). Transporting a School-Based Intervention for Social Anxiety in Canadian Adolescents. Canadian Journal of Behavioral Science, 43(4), 287-296. DOI: 10.1037/a0023174

Martinez, Y., & Ercikan, K. (2009). Chronic illnesses in Canadian children: The effect of illness on academic achievement, and anxiety and emotional disorders. CHILD: Care, Health, and Development, 35(3), 391–401. DOI: 10.1111/j.1365-2214.2008.00916.x

Rose, H., Miller, L, & Martinez, Y. (2009). "FRIENDS for Life": The results of a resilience-building, anxiety-prevention program in a Canadian elementary school. Professional School Counseling, 12 (Special Issue), 400-407. DOI: 10.5330/PSC.n.2010-12.400


Shumka, E., Jitlina, K., Martinez, Y., Miller, L., Ford, L. (2016). Case Studies of Children with Anxiety and Low Incidence Disabilities. A poster presented at the Annual Convention of the National Association of School Psychologists (NASP), New Orleans, Louisiana, USA, February 2016.

Martinez, Y. & McKee, W. (2011). School and Clinical Interventions for Selective Mutism and Associated Disorders. A Mini-Skills Session at the Annual Convention of the National Association of School Psychologists (NASP), San Francisco, California, USA, March 2011. Declined acceptance.

Martinez, Y., Tannock, R., Manassis, K., & Garland, J. (2010). Cross-Disciplinary Partnerships in the Assessment and Treatment of Children with Selective Mutism.  A paper accepted to the Annual Convention of the 71st Canadian Psychological Association (CPA), Winnipeg, Manitoba, Canada, 2010. Declined acceptance.

Ford, L., McKee, W., McIntosh, K., Lipka, O., Martinez, Y., Nirmal, R., Swart, S., Ballou, J., Cole, K., Holmes, B. (2010). Trainer’s of School Psychologists. A symposium accepted to the Annual Convention of the 71st Canadian Psychological Association (CPA), Winnipeg, Manitoba, Canada, 2010. 

Martinez, Y. & Miller, L. (2009). Silent no more: bridging school-clinical interventions for selective mutism. An invited Participant Information Exchange (PIE) to the Annual Convention of the National Association of School Psychologists (NASP), Chicago, Illinois, USA, March 2010. 

Martinez, Y., Tannock, R., Manassis, K., Garland, J., McInnes, A., & Clark, S. (2008). Multiple informant agreement of Selective Mutism ratings for school-age children. A paper presented at the Annual Conference of the Anxiety Disorders Association of America (ADAA), Santa Ana Pueblo, New Mexico, USA, March, 2009.

McKee, W., & Martinez, Y. (2008). IEPs: Where's the data? Conversation Session at the 69th annual meeting of the Canadian Psychological Association, Halifax, Nova Scotia, Canada, June 2008. 

Martinez, Y., & Ercikan, K. (2007). Educational and psychological effects of childhood chronic illnesses. Poster presented at the 68th annual meeting of the Canadian Psychological Association, Ottawa, Ontario, Canada, June 2007.

Martinez, Y., & Ercikan, K. (2006, June). Investigating the inter-relationship between school achievement, socioeconomic status (SES), community type and health/nutrition in Canada. Poster presented at the 67th annual meeting of the Canadian Psychological Association, Calgary, Alberta, Canada, June 2006.

Ercikan, K., Arim, R., D’Almeida, M., Liu, Y., & Martinez, Y. (2006, February). Instructional practices associated with learning outcomes for different schools with low and high levels of resources. Invited presentation to Council of Ministers of Education, Canada and Social Science & Humanities Research Council (SSHRC), Victoria, British Columbia, Canada, February 2006.

Hymel, S., Martinez, Y., Hearle, N., Darwiche, L., Clarke, S., Rocke-Henderson, N. & Matear, D. (2005, May). Strathcona Social Interaction Program: An innovative attachment-based approach supporting elementary-aged students with behavioural difficulties. Symposia at the 5th Annual Research Day of the University of British Columbia, Vancouver, British Columbia, Canada, May 2005.

Drysdale, M. & Martinez, Y. (2003, June). A comparison of the effects of reading and emotion in children diagnosed with Asperger’s Syndrome before and after neurofeedback training. Poster presented at the 65th annual meeting of the Canadian Psychological Association, St. John’s, Newfoundland, Canada, June 2004.