Dr. Hajar Mohd Salleh Sahimi is a distinguished Psychiatrist and Medical Lecturer at UKM, specializing in general psychiatry with a keen focus on child and adolescent psychiatry, psychological therapy, and psychopharmacotherapy. She is notably recognized for implementing Brief Dialectical Behavior Therapy (DBT) skills training for Borderline Personality Disorder in Malaysia and has made significant research contributions in areas like emotional regulation, mental health stigma, and screening instrument validation for the Malay population. Her work also addresses contemporary issues such as COVID-19's impact on mental health and smartphone use among medical students.