Meet Our ABA Therapy Team
Board Certified Behavior Analysts, Registered Behaviour Analysts, a Speech-Language Pathologist, and dedicated instructor therapists, working together to deliver evidence-based, individualised care for children and youth with autism and their families across Ontario.
Clinicians and Leaders Who Put Your Child First
Every OBSS programme is designed and supervised by certified clinicians and delivered by trained therapists who build real, trusting relationships with the children and families they support.
Leadership
Co-Founder
Gyath Shammha
Director & Co-Founder
With more than 15 years in emergency services, including work as a ground and air ambulance paramedic, Gyath founded OBSS to support people with special needs and their families.
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- Master of Science in Emergency Service Management
- Bachelor of Science in EMS Administration
Gyath brings a background in high-pressure, people-centred care to the way OBSS is run: responsive, reliable, and focused on the needs of every family. gyathshammha.com →
Clinical Director
Malik Hamdan
Clinical Director
Since 2011 Malik has worked as a Speech-Language Pathologist, Audiologist, and ABA therapist, moving into senior clinical leadership. He leads OBSS's commitment to evidence-based care and meaningful outcomes.
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- Master's in Communication Sciences, Western University
- Graduate Certificate in Autism and Behavioural Sciences, Mohawk College (2019)
- Bachelor's in Speech-Language Therapy and Audiology, Jordan University of Science & Technology (2010)
Malik's combined background in communication and behaviour analysis shapes how OBSS integrates ABA with speech and language goals.
Clinical Supervisors (BCBA)
BCBA · RBA
Anda Koncz, M.Ed.
Clinical Supervisor
Anda has supported people with developmental disabilities aged 3 to 30+ in clinical, school, recreational, and in-home settings in Toronto and Vancouver, with a focus on relationships, inclusion, and long-term success.
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- Master of Education in Special Education, University of British Columbia (2023)
- Honours Bachelor of Behaviour Analysis, George Brown College (2021)
- BCBA and Registered Behaviour Analyst (Ont.), 2026
Anda joined OBSS as a Senior Therapist in May 2025 and was promoted to Clinical Supervisor. She builds strong partnerships with families and advocates for every client's inclusion.
Jacquelyn Leroux
Clinical Supervisor
Jacquelyn delivers ABA across home, school, clinic, and community settings, building communication, social, emotional-regulation, daily-living, and academic skills through individualised programming.
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- MA in Applied Disability Studies (ABA specialization)
- BA (Specialized Honours) in Child Studies
- BA in Psychology
- Member, CPBAO
At OBSS, Jacquelyn oversees client programming, conducts assessments, coaches parents, and supports the clinical team.
Instructor Therapists
Instructor Therapist
Dinith Wijesuriya
Instructor Therapist
Over three years supporting people with autism in Sri Lanka and Canada, building meaningful connections that help every child progress.
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- Bachelor's in Psychology, University of West London (UK)
- Postgraduate Certificate in Addictions and Mental Health, Fanshawe College
Outside of therapy, Dinith is passionate about music and about promoting kindness in every part of life.
Alexandra (Alex) Tsoi
Instructor Therapist
Alex takes a client-centred approach, creating a welcoming environment tailored to each person and focusing on independence and essential life skills.
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- Honours BA in Behavioural Psychology, Seneca College
- Behavioural Sciences Diploma, Seneca College
Houriya Nazakat
Instructor Therapist
Houriya brings ABA experience from clinical and educational settings, using evidence-based, culturally responsive approaches and working closely with families.
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- Master's student in Developmental Psychology and Education, OISE (University of Toronto)
- Currently working toward BCBA certification
What Every OBSS Clinician Stands For
Certified Supervision
Every programme is designed and overseen by a Board Certified Behavior Analyst and Registered Behaviour Analyst.
Child-Centred Care
Respectful, positive, and individualised, built around your child's strengths, interests, and dignity.
Evidence & Data
We use evidence-based practices and track progress every session, so decisions are guided by real results.
Family Partnership
Parent coaching and open communication mean families are part of the team, not just updated by it.
Join Our Team
We're growing across the GTA, Hamilton, and Halton Region and looking for people who care deeply about children and families.
- BCBA supervision and ongoing clinical training
- In-home and in-centre work across 10 communities
- A supportive, multidisciplinary team
Work With Our Team
Book a free consultation to talk with our clinical team about your child's needs, OAP funding, and in-home or in-centre therapy.
