Meet The Team

Our dentists are supported by a dedicated team of highly trained Hygiene professionals

  • Dr Timothy Tan BDSc (WA) Practice Principal

    Dr Timothy Tan is a Principal Dentist at St Quentin Dental and the longest serving dentist at the practice. After graduating from the University of Western Australia in 1991, Tim started his dental career in a private practice in the Snowy Mountains of NSW.

    It was to provide an excellent grounding for Tim. Under the mentorship of his 2 Principal Dentists, who were also members of the Perisher Ski Patrol, Tim was exposed to a range of dental trauma cases which fed his passion for both endodontics and skiing. It also formed a foundation for his future role as a mentor at St Quentin Dental.

    Following his 2 years in the Snowy Mountains, Tim took a sabbatical year back in his home town of Singapore. It proved a fortuitous decision. It allowed him some time away from dentistry to undertake a stint in journalism, where he freelanced as a golf and wine writer. It was also during this time that he met his wife to be, Bernadette.

    Moving back to Perth in 1995, Tim resumed private practice in the CBD and in 1999, Tim sold that practice to begin a full time post graduate MBA. It was during this time that he joined St Quentin Dental and in 2002 became a full partner.

    Tim lives locally in Claremont with Bernadette and his 3 sons. His free time is spent travelling with his family and playing golf at Nedlands Golf Club and Royal Perth Golf Club, of which he is a member.


  • Dr Asheen Behari BDS. (Witwatersrand) Practice Principal

    Asheen Behari graduated from the University of the Witwatersrand in 1993 and joined the St Quentin dental practice in 2004 after 6 years of private practice in Kensington London. In 2007 he completed a Post Graduate program in Clinical Dentistry, focusing on Oral Implants at the University of Sydney. Aside from being a keen fisherman, golfer, cyclist and appreciator of wine he has a very special interest in providing high quality dentistry to his patients. Asheen has a focus on Aesthetic and Restorative dentistry coupled with 22 years of experience with Dental Implant Reconstructions. He is involved in facilitating and participating in Lecturing, Training and Mentoring programs for other dental practitioners and is a Clinical Senior Lecturer at the University of Western Australia.


  • Dr Sally McMullen BDSc (Hons) (WA)

    Dr McMullen graduated from the University of Western Australia in 2009 with honours and has been with St Quentin Dental since January 2010.

    Since graduating, Sally has dedicated herself to the pursuit of excellence in dentistry. She has attended an extensive and broad range of professional development courses in the fields of aesthetic dentistry, periodontal therapy, endodontic (root canal) therapy, implant dentistry and paediatric dentistry. Sally has completed training for, and is a provider of Invisalign, a popular alternative to braces.

    Sally is a general dentist with a particular interest in minimally invasive aesthetic dentistry, crown and bridge restorations, paediatric dentistry and caring for patients with dental phobias. The St Quentin philosophy of prevention of oral diseases for life is one that Sally is passionate about.

    Sally grew up in Geraldton and learned to love the art and science of dentistry from a young age; Sally’s father is a dentist as is her sister. Sally was a boarder at Methodist Ladies’ College in Claremont.

    In 2012 Sally married her husband David and took a three-month honeymoon travelling throughout Europe. Sally and David love to travel both abroad and in the countryside where they take their camper trailer on any weekend they can.

  • Dr Sean Chia BDSc (Hons) (WA)

    Dr Chia graduated with honours from the University of Western Australia in 2011, receiving faculty prizes for being the highest scoring graduate in both theory and clinical practice. He has also received awards in periodontics, preventive dentistry, anatomy and general pathology.

    Sean enjoys the many facets of dentistry involved in general practice, and strives to treat all of his patients in a gentle, caring and compassionate manner. He always aims to complete work to the highest possible standard, and regularly attends courses to further his knowledge and skills.

    Away from dentistry, Sean enjoys spending time with his family (including four younger brothers), playing the piano, and travelling with his friends. He leads an active lifestyle, plays club hockey and competes in triathlons.



  • Dr Alex Siu BOH DSc Grad.Dip.Dent (QLD)

    dr alex siu st quentin dental

    Originally born and raised in Brisbane, Dr Alex Siu graduated from Griffith University in 2016 before moving West and commencing practice in Kalgoorlie.

    Quickly accepted by the locals who loved his friendly style and open manner, Alex spent 3 busy years providing the full gamut of general dentistry to the Goldfields district before making the move to Perth in 2019.

    Alex understands that getting dental work done is not everyone's favourite pastime so he aims to bring a gentle, kind and caring attitude to all of his patients.

    Alex is fully committed to upholding the excellent standard of patient care expected from St Quentin’s Dental Principal Dentists and patients alike.

    Alex enjoys travel, keeping fit and is an avid fan NBA.