Matt Costaris, Clinical Associate


Matt provides psychoeducational assessments and therapy to children and adolescents. He has experience in the assessment of learning disabilities, developmental disabilities and social-emotional difficulties. In therapy, he uses an integrative approach pulling from multiple theories, and has a particular interest in working within the family system.

Matt received his Master’s degree in School and Clinical Psychology from the University of Toronto in 2019 and is currently working towards his PhD in the same program. Prior to his work in psychology, Matt received his Bachelor’s in Education from the University of Toronto and spent five years teaching classes from Kindergarten to Grade 12.


Matt practices in a range of modalities, including Psychodynamic, Humanistic, Emotion-Focused and Cognitive-Behavioural.  After working closely with the individual/family to hear their story, Matt draws upon techniques from each in order to create a treatment plan to best meet their needs.  He also understands that goals often shift through the course of therapy, so he likes to include clients in the process throughout to ensure that they feel understood and believe in the work.  Matt also recognizes the key role families play in their children’s’ lives and, when appropriate, tries to work with families as well in developing and maintaining positive behaviours.


Matt graduated with his Master’s in clinical psychology in 2019 and is currently pursuing his doctorate at OISE/University of Toronto, a CPA accredited program.  Understanding that the therapeutic alliance is a major predictor of successful outcomes in therapy, his doctoral research expands upon his clinical interests as he investigates the best methods to engage children and adolescents in the treatment process, with a particular focus on at-risk populations.  He has worked within the Toronto District School Board and private practices conducting assessments on children and adolescents with wide-ranging presenting issues.  Prior to his work in psychology, Matt was a teacher, spending one year teaching kindergarten and four years in high schools teaching English, Mathematics and Social Studies.  He tries to integrate his teaching experience with his clinical work, considering the realities of the classroom setting when making recommendations to best ensure that a student’s needs are met.


When not working, Matt loves to read, watch movies and enjoy the outdoors.



Matt is in the office on Saturdays.  Please contact our administrator at (905) 472-9658 if you are interested in services.


Copyright 2020 Markham Psychologists | Individual, Couples and Family Therapy