Siew graduated with her bachelor, master, and doctorate degrees from The University of Melbourne. She has had more than a decade of experience as a clinical psychologist, across both private and public sectors.

She started her career in Australia, where she was program manager of an eating disorder ward at The Geelong Clinic. After relocating to Singapore in 2016, Siew was a Senior Clinical Psychologist at Changi General Hospital, working with patients with a wide range of psychological issues. She started providing therapy in private practice from 2020, including to corporate clients.

Siew enjoys working with individuals who struggle with managing emotions and anxiety, unhelpful relationship patterns, perfectionism, burnout, poor body image, and difficulties relating to sexuality and gender identity. She draws from a range of approaches including Schema Therapy, Dialectical Behaviour Therapy, Motivational Interviewing, Acceptance and Commitment Therapy, and Cognitive Behaviour Therapy. She supports her clients to understand how early life experiences contribute to current unhealthy patterns, make sense of their emotions, develop self-compassion and meaningful connections, and lead lives aligned with their values.

Siew immensely enjoys teaching, education, and supervision. She has held teaching/supervision roles with a number of institutions including The University of Melbourne and SingHealth hospitals and polyclinics. Additionally, Siew is a strong advocate for inclusion and diversity and previously volunteered at Oogachaga, a non-profit organisation supporting the LGBTQ+ community.

Siew lived in Melbourne, Australia, for 15 years. In that time, she fulfilled her childhood dream of becoming a qualified hairdresser and has styled friends and family for events.