His approach to therapy is founded in evidence-based therapies including Cognitive Behavioural Therapy (which is widely considered to be the most effective form of psychotherapy for anxiety and depression) and Emotion-Focused Therapy. The main focus of his clinical practice is providing psychological treatment to adolescents, adults and couples to enhance their skills and coping using techniques that are grounded in scientific research. Mazen specializes in the assessment and treatment of anxiety, stress, and depression. He has treated social, behavioural and mood disorders and anxiety disorders including separation anxiety, health anxiety, generalized anxiety disorder, specific phobias, social anxiety disorder, obsessive-compulsive disorder, and panic disorder.