Registered Provisional Psychologist

Leighton Dahl

Leighton Dahl is a Calgary psychologist who provides comprehensive psychological assessments for adults seeking diagnostic clarity — including ADHD, executive functioning, and diagnostic clarification for a range of mental health concerns.

Leighton Dahl is a Registered Provisional Psychologist who provides comprehensive psychological assessment services for adults. Leighton’s work is grounded in evidence-based practice and guided by a thoughtful, strengths-based framework that emphasizes understanding how each individual’s brain functions and how this may influence one’s behaviour, learning, and emotional well-being.

Leighton’s combined expertise in clinical practice and psychological assessment enables comprehensive evaluations of psychological and intellectual functioning, academic achievement, learning differences, executive functioning, and social-emotional development. These assessments help identify profiles associated with ADHD, anxiety and mood disorders, giftedness, specific learning disorders, and intellectual disabilities. Her tailored, clearly written reports equip clients with the information needed to confidently pursue workplace and academic accommodations, and applications for government funding, scholarships, and other supports.

Leighton’s adult assessment practice places strong emphasis on careful differential diagnosis; the process of thoughtfully exploring and distinguishing between possible explanations for a person’s symptoms to ensure the most accurate understanding, rather than drawing quick conclusions or applying labels prematurely. She takes a compassionate trauma-informed approach, examining how cognitive, emotional, developmental, and life experiences collectively influence a person’s current functioning.

Leighton’s report-writing approach goes beyond standardized templates, creating assessments that capture the full complexity of each individual’s profile. Her reports are known for their depth, accuracy, and clarity, translating complex psychological concepts into clear, accessible explanations and practical recommendations that help clients feel informed, confident, and supported.

Above all, Leighton’s goal is for her clients to complete the assessment process feeling understood and validated; with a comprehensive, actionable plan designed to promote measurable progress in the areas where they are currently facing challenges.