ABA & Autism Support Services in Whitby & Durham Region

Ascent Clinical Services provides applied behaviour analysis (ABA), counselling, and speech-language therapy for children and youth with autism and developmental disabilities.

Our team of Registered Behaviour Analysts, a registered social worker, and a CASLPO speech-language pathologist deliver individualized, evidence-based care — in our Whitby clinic or virtually anywhere in Ontario. As an approved Ontario Autism Program (OAP) provider, we help families access the right service, without the wait

Our services

  • A behaviour analyst engaging a young child in a play-based therapy activity, using toys to support learning and skill development in a clinical setting

    Early Years Caregiver-Mediated

  • A behaviour analyst working one-on-one with a child at a therapy table, engaged in a structured activity in a bright clinical setting

    Applied Behaviour Analysis (ABA)

  • A therapist writing thoughts, behaviours, and emotions on a whiteboard during a CBT session with a teenage client in a warm, welcoming therapy room

    Mental Health Services

  • A speech-language pathologist working one-on-one with a young girl on spelling and literacy skills using a whiteboard and letter tiles

    Speech-Language Pathology

A father holding his young son close, foreheads touching, in a park — a moment of calm connection between parent and child.

DBT Skills Group For Parents

Regulating your emotions while parenting emotional children.

A 10-week virtual DBT skills group for caregivers. Learn to regulate your own emotions so you can support your child through theirs.

  • Mindfulness · Distress tolerance

  • Emotion regulation · Interpersonal effectiveness

  • Facilitated by Jordanna Guida, MSW, RSW

Meet our team

  • Melissa Lavallee, BCBA and founder of Ascent Clinical Services

    Melissa Lavallee

    Registered Behaviour Analyst

  • Lisa Giewercer, RBA, Ascent Clinical Services

    Lisa Giewercer

    Registered Behaviour Analyst

  • Laura Endicott, Senior ABA Clinician, Ascent Clinical Services

    Laura Endicott

    Senior ABA Clinician

  • Urvashi Sirur, ABA Clinician, Ascent Clinical Services

    Urvashi Sirur

    Senior ABA Clinician

  • Jordanna Guida, RSW, Ascent Clinical Services

    Jordanna Guida

    Registered Social Worker

  • Juliana Hifawi, SLP, Ascent Clinical Services

    Juliana Hifawi

    Registered Speech-Language Pathologist

In-person and remote options

We provide in-person services in our Whitby clinic or with community organizations throughout Durham Region, north-east Toronto, and York. Outside of our catchment area or prefer virtual services? We’ve got you covered with teletherapy.

Get started with

Ascent Clinical Services.