Meet our team.
Our clinicians bring together advanced training, diverse experience, and a supportive approach to care. We work collaboratively to provide evidence‑based services in diabetes, weight management, and women’s health.
Siana Critchett
Founder I Registered Nurse I Registered Midwife I Credentialled Diabetes EducatorSiana is a Registered Nurse, Registered Midwife, and Credentialled Diabetes Educator with experience supporting people living with diabetes across a range of life stages. She has extensive knowledge of diabetes technologies, including continuous glucose monitoring, smart insulin pens, and insulin pump therapy across multiple device platforms. She is a certified product trainer for insulin pump and continuous glucose monitoring devices.
Her areas of focus include diabetes self‑management, gestational diabetes, insulin initiation, insulin pump therapy, pre‑diabetes, and type 1 diabetes. She works with young adults, adults, families, and people with disabilities, providing clear, practical information to support day‑to‑day diabetes management.
Siana is committed to person‑centred care and works collaboratively with individuals and their healthcare teams to support safe, coordinated diabetes management. She has served as the Chair of the Australian Diabetes Educators Association WA Branch, and is the Course Coordinator for the Postgraduate Diabetes courses at Curtin University.
Outside of work, Siana has three boys and two dogs… and spends quite a bit of time driving and drinking coffee!
Shannon Tassell
Nurse Practitioner I Credentialled Diabetes EducatorShannon is a Nurse Practitioner and Credentialled Diabetes Educator based in Perth. She began her nursing career after completing her degree at Curtin University and gained early experience in country Western Australia before undertaking further studies in critical care.
Since returning to Perth in 2000, Shannon has worked across a range of primary health settings and became a Nurse Practitioner in 2009. She is also a Credentialled Diabetes Educator and has completed the World Obesity Federation SCOPE certification, along with additional training in women’s health, diabetes, and obesity management.
Shannon has particular interests in weight management, PCOS, insulin resistance, and the hormonal factors that influence metabolic health. She also provides care related to women’s health across the lifespan, including pre‑pregnancy health, perimenopause, and menopause. Shannon supports people in making informed decisions about their health and offers guidance in advance care planning and end‑of‑life discussions with sensitivity and clarity.
Outside of her clinical work, Shannon enjoys being a taxi service to 3 teenagers.
Kate Harris
Administrative Manager ExtraordinaireKate brings over 25 years of experience working with children, young people, and families, with a background in education, leadership, and administration. During her many years as a teacher at the Perth School of Ballet, she worked alongside children and families managing diabetes and gained an appreciation of the importance of understanding and supporting their individual needs, as well as the impact that this has on their everyday lives.
Since joining Health Seeds, Kate has enjoyed developing her knowledge of diabetes education and has gained an even greater appreciation of the difference knowledgeable, compassionate, and individualised care can make.
Kate is passionate about ensuring that people living with diabetes feel heard, supported, and valued. She enjoys being part of a team that advocates for people to receive the care, education, and attention they deserve, and believes no one should feel overlooked when it comes to their health.
Kate firmly believes most days can be improved with a good song and the occasional spontaneous dance.