Dr Crystal McMullen

Director/Clinical Psychologist

BA (Psych, Hons I), BBusMan, DPsych (Clin), MAPS

We are a small team of Psychologists and Clinical Psychologists experienced in work with children and families. We offer Assessment and Treatment of a range of presenting concerns, and aim to provide support and understanding not only to the child, but to the whole family.

Meet Our Team

Dr Crystal McMullen is the director of All for Kids Therapy, and is a fully qualified Doctor of Clinical Psychology. Crystal has substantial experience in the assessment and treatment of children and adolescents, as well as working closely with the parents and families of these children. Crystal has worked extensively with children and families within government and non-government agencies, including community clinics, child and youth mental health services, hospitals, and private practice. Crystal has a passion for supporting the emotional and psychological wellbeing of children and their families, and provides assessment and treatment of many issues, but in particular, focussing on:

• Anxiety

• Behaviour Problems
• Cognitive and Learning Assessments (including Dyslexia)
• Parenting Support

• Low self-esteem

Crystal utilises a number of empirically validated treatments in her work including:

• Cognitive Behavioural Therapy
• Play Therapy
• Interpersonal Therapy
• Schema Therapy
• Attachment-based Treatment
• Triple P
• Family therapy
• Strengths-based Therapy
• Narrative Therapy
• Brief Solution-Focused Therapy
• Sandplay Therapy


• Registration with Psychology Board of Australia
• Endorsement as a Clinical Psychologist with Psychology Board of Australia
• Full Membership with Australia Psychological Society

Research and Academic Achievements

Crystal has also been involved in research investigating the risk factors and treatment of childhood anxiety. Crystal completed her Doctor of Clinical Psychology degree at the University of Queensland and focused her research on this area. Crystal is fully registered as a Clinical Psychologist with the Psychology Board of Australia, she currently spends most of her time working in private practice, but has also worked as a Lecturer and Course Coordinator at the University of Queensland and University of Southern Queensland, teaching and managing Undergraduate and Postgraduate Psychology courses. Crystal has been awarded numerous Dean’s Commendations for Outstanding Achievement in the area of Psychology, as well as Awards for Excellence in Teaching.

My photo_edited.jpg

Kelsey Erdelyi

Registered Psychologist/Clinical Psychology Registrar

BPsychSc; MPsych(Clin)

Kelsey is a registered psychologist and clinical psychology registrar. She enjoys working with children and adolescents from a variety of cultural and linguistic backgrounds, and has worked alongside individuals experiencing a range of psychological challenges. 


Kelsey has worked with children and families in community mental health, inpatient settings, private practice, and supported children and families engaged with foster and kinship care services. She has particular interests in:


  • Child Protection

  • Attachment 

  • Parenting Support 

  • Emotion Regulation 

  • Behavioural Difficulties 

  • Anxiety

  • Depression

  • Anger Management

  • Stress Management


Kelsey works from a Cognitive Behavioural Therapy (CBT) approach, incorporating other frameworks including Systems and Attachment, play therapy, and Acceptance and Commitment Therapy (ACT). Kelsey also has experience administering a variety of psychological assessments for individuals across the lifespan, and is passionate about holistic and comprehensive assessment to support individuals to achieve their full potential.



  • Australian Psychological Society

  • Registration as a General Psychologist and Clinical Psychology Registrar with the Australian Health Practitioners Regulation Agency