Meet the Team

Meet the Team

Cassandra White

Cassandra has been the owner and Director of RMPS since 2013. She brings more than 20 years of experience in working with children and families to the practice. Her background and expertise in the areas of assessment and treatment of Autism Spectrum Disorders and ADHD as well as her knowledge of neurofeedback therapy and play therapy give her the broad base of knowledge to direct this multi-faceted private psychology practice.

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In addition to her experience in assessment and treatment of learning disabilities and giftedness, Cassandra has training and expertise in Child Psychotherapy and Play Therapy. She has worked extensively with children and their families regarding treatment of anxiety, depression, behavioral issues and emotion regulation using play-based and expressive interventions. Cassandra is also a clinical supervisor who provides supervision and consultation to other practitioners specializing in working with children.

Cassandra’s experience and knowledge is not only academic; she is the mother of four children. Her experience of being a parent of four children makes her a very practical and realistic therapist. She understands the demands of parenting and does not rely on “book knowledge” or recommendations that appear unattainable for parents. She prides herself in understanding both the needs of the parents and the child. She looks for ways to enhance family functioning so that parents can feel competent and successful in their difficult jobs of raising children with a variety of complex needs.

Helena Morris

Helena Morris is a Registered Psychologist with the College of Alberta Psychologists. Helena holds a Master’s in Counselling from the University of Victoria, and she specializes in providing counselling and psychotherapy to children, youth and families who are facing various challenges and mental health concerns.

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Helena has worked with children and their families for about 10 years. She draws from narrative and cognitive behavioural therapy approaches and utilizes sensory exploration, grounding and mindfulness during sessions. She works within an attachment-based and trauma-informed lens to help young people build resilience and emotional regulation.

Helena has experience working with a wide range of presenting issues including anxiety and depression, Attention Deficit Hyperactivity Disorder (ADHD), Autism Spectrum Disorder, addictions, trauma and behavioural concerns. She also has training and experience in suicide intervention and prevention and non-suicidal self-injury. Helena has worked within a variety of settings including crisis residential programs, schools and mental health centres.

Kellie Lanktree

Kellie is a Registered Psychologist with the College of Alberta Psychologists. She completed a Bachelor of Child and Youth Care with the University of Victoria and a Master of Education in Counselling Psychology through the University of Lethbridge.

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Kellie has over 10 years experience supporting children and youth with developmental disorders/delays and their families. Kellie has experience working in schools, clinical settings, and within homes to provide support and therapeutic interventions. Through her time at RMPS, Kellie has also gained experience in helping individuals affected by trauma, grief/loss, separations, emotional dysregulation, depression, and anxiety. Kellie practices through developmental, attachment-based and trauma-informed lenses, and draws from a variety of play-based approaches such as Synergetic Play Therapy, Child-centered play therapy, DIR/Floortime, art-based mediums, and mindfulness-based practices. Kellie also provides Neurofeedback therapy, and is working on receiving her certification through BCIA. Kellie believes in meeting children and their families where they are at and that there is no “one size fits all” for therapy.

Denise Riewe

Denise has completed a Bachelor of Health Sciences through the University of Lethbridge and a Master of Counselling with Athabasca University. She is a Registered Provisional Psychologist with the College of Alberta Psychologists and a member of the Psychological Association of Alberta.

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Denise has over 9 years of experience supporting children, youth and their families in both residential and community-based practices. Denise is experienced in working with high and at-risk youth, supporting children and their families with strength-based approaches.

She practices from a client-center approach supported by Cognitive Behaviour Therapy, Dialectical Behaviour Therapy, Theraplay, and other play and art-based modalities.

Crystal Popke

Crystal is a Registered Psychologist with the College of Alberta Psychologists and a member of the Psychologists’ Association of Alberta. Crystal has completed a Bachelor of Biological Sciences and a Bachelor of Religious Studies with the University of Calgary and a Master of Arts in Counselling Psychology through Yorkville University.

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Crystal is experienced in supporting children, adolescents, and their families who are dealing with concerns related to anxiety, depression, emotion regulation, interpersonal conflict and self-esteem and identity. In addition, Crystal has a strong clinical interest in attachment and trauma-based interventions and modalities. Crystal has built her practice around strengths-based, integrative modalities and draws on child-centered play therapies, expressive arts therapies, cognitive-behavioural techniques, mindfulness practices and Theraplay®️. Crystal is passionate about supporting and empowering children and adolescents in overcoming obstacles and discovering their full potential!

Fiona Donovan

Fiona Donovan is one of the friendly voices you hear when you call RMPS. She has more than 25 years of experience as an Administrative Assistant and Office Administrator. Fiona is passionate about serving our clients and will always go the extra mile to put a smile on your face.

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Maigan Birse

Maigan has worked in the field of child, adolescent and adult mental health for the last 14 years, becoming a Registered Psychologist with the College of Alberta Psychologists in 2014 after receiving her Masters in Applied Counselling Psychology from the University of Calgary in 2012.

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Maigan has worked in private, public, and not-for-profit organizations and truly believes that she has the best job ever!

Maigan utilizes many different modalities in her work with clients and families, including Cognitive Behavioural Therapy, Emotion-Focused Therapy, Dialectical Behavioural Therapy, Directive and Non-Directive Play Therapy, and Solution-Focused Therapy. Maigan believes that “connection with others can be one of the most important factors in creating resilience in children and their families”.

It doesn’t stop there, as Maigan has an interest in pursuing more assessment experience and in being certified in trauma-focused therapy.

Kelsey Moss

Kelsey is a Psychological Assistant at RMPS, specializing in Biofeedback. She completed her Bachelor of Science in Psychology from the University of Victoria in 2019, and is currently a Master of Arts in Counselling Psychology student with Yorkville University.

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Kelsey spent four years researching concussions and mild traumatic brain injuries during her studies, and has over two years of experience administering qEEG (Quantitative Electroencephalogram) Brain Maps and Neurofeedback. She is also a 200hr Yoga Teacher trained in mindfulness and the mind-body connection

Shamir Ladhani

Shamir joined Rocky Mountain Psychological Services (RMPS) in 2018 as a Business Consultant and is currently serving as Senior Business Consultant. Being an engineer, he gets excited about evidence-based technologies applied at RMPS to help individuals improve self-regulation, manage ADHD symptoms and enhance their abilities to function at their peak in personal and professional settings.

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Being a father, he is passionate about serving families, especially children whose mental well-being is paramount to our society’s future.


Shamir is a former Vice-President of a Calgary-based Fortune 500 engineering company. After achieving standing as a HeartMath(R) Certified Trainer and HeartMath(R) Certified Coach, he was invited to speak on local, national and international stages featuring notable authors and speakers in Italy, Germany, Czech Republic, Mexico and the United States. He is a proud father of two daughters, a supporter of the Calgary Distress Centre, an award-winning stage actor, business growth consultant and a leadership coach and trainer.

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