About us

Meet some of the team behind Impression Dental Group

Our leadership team is supported by a dedicated team driven to deliver the best experience possible so you can focus on patient outcomes.


Mark O’Brien

Chief Executive Officer / Director

Mark has held executive roles across several industries, including Animal Health, Aged Care, Allied Healthcare, and Childcare.

He has direct experience in business consolidations and integration, developing several businesses to reach key operational milestones while working with numerous investment parties, including private equity.

He is a passionate people leader and a recent participant in the Bain & Company Future Leaders Academy in Healthcare.

A/Prof Christopher Ho

Chief Dental Officer / Director

Dr Christopher Ho is a Specialist Prosthodontist who received his Bachelor of Dental Surgery with First Class Honours at the University of Sydney. He completed postgraduate studies in the Graduate Diploma in Clinical Dentistry in Oral Implants at the University of Sydney, a Masters of Clinical Dentistry in Prosthodontics with Distinction from the University of London and Doctorate in Clinical Dentistry in Prosthodontics from the University of Sydney. He is Fellow of the Pierre Fauchard Academy, Special Field Member of the Royal Australasian College of Dental Surgeons in Prosthodontics and a Fellow of the American College of Dentists.

Dr Ho lectures extensively on aesthetic and implant dentistry both nationally and internationally. He is a visiting lecturer to the postgraduate programs at the University of Sydney, Adjunct Associate Clinical Professor at University of Puthisastra, Faculty member of the Global Institute for Dental Education and Visiting Lecturer at Kings College London, United Kingdom. He is Head of School of Postgraduate Dentistry at the Australasian College of Dental Practitioners. He is author of numerous publications, as well as Editor of the Wiley textbook “Practical Procedures in Aesthetic Dentistry” and “Practical Procedures in Implant Dentistry”.

Dr Aodhan Docherty

Chief Education Officer

Dr Docherty is a graduate of the University of Sydney Bachelor of Medical Science and Bachelor of Dentistry, completing his studies with honours and a University Medal. He has engrossed himself in postgraduate education becoming alumni of the Fahl Cosmetic Academy, the Kois Academy, completing a two-year orthodontic mini-residency through EODO and the City of London Dental School and has completed a Graduate Diploma in Clinical Dentistry in Oral Implants at the University of Sydney.

 Dr Docherty is passionate about mentoring and teaching and is an examiner of the postgraduate Oral Implant Diploma at the University of Sydney. He believes in a literature-based approach to dentistry and is an author of the soon-to-be-released Wiley-Blackwell textbook “Practical Procedures in Implant Dentistry”.

Cindy Barnes

Chief Financial Officer

Cindy is a Chartered Accountant with over 15 years’ experience. She holds a Bachelor of Business from Edith Cowan University and is a member of Chartered Accountants Australia and New Zealand and a registered BAS Agent.

Edward Heckes

Chief Marketing Officer

Edward began his career at advertising firms Leo Burnett and DDB, where he was ranked as one of the top creatives in the world.

He has worked internationally within one of the world’s fastest growing FMCG start-ups, was formerly a consultant, the Global Head of Marketing for a MedTech group, and was the Marketing Director for an ASX listed healthcare data entity and Head of Growth for private equity firm Genesis Capital.

Edward holds a Double Bachelor of Business and Arts from Monash University.

Katie Robbins

National Clinical Operations Manager

Katie has spent the last 11+ years in Regional Management roles in both Dental and Veterinary businesses. This includes 4 years as Regional Operations Manager at Maven Dental Group and 15 years in the veterinary industry.


Amanda Bubear

Regional Operations Manager

Amanda has been in the dental industry on and off for most of her working life as her first job in school was covering reception and dental assistant shifts in her family’s dental practice in the ACT. Upon leaving university she spent about a decade in the hotel industry, before deciding to return to post-grad study. Whilst studying part-time she took on the role of Practice Manager in her family’s practice which sold to Dental Partners (Maven) in 2008. Amanda then made the switch to the world of corporate dentistry, becoming a Regional Operations Manager with Maven in 2010. In 2018 she had a brief stint in a similar role for a group of cosmetic clinics, before realising the dental industry was her true calling! Amanda returned to Maven Dental Group in 2020 as Regional Operations Manager/Project Manager. Amanda takes enjoyment from working with different practices and their teams to help support them in delivering exceptional patient experiences and is looking forward to being able to learn from a new group of practices with Impressions Dental Group.

In Amanda’s spare time you will normally find her at Canberra Stadium cheering on the Brumbies or following the Wallabies on their World Cup campaigns. She also loves spending time with her young nephew and niece whenever she can make the trip to the Gold Coast.

James Casey

GM - Mergers & Acquisitions

James has over 8 years of experience in growth-focused roles across diverse industries including healthcare. 

He is a lifelong learner having recently completed an MBA and Master of Marketing from Melbourne Business School.

James is passionate about dental and healthcare within Australia and strongly believes that when you focus on people first, business results will inevitably follow.

Alyssa Ho

Marketing Associate

Alyssa has over 8 years’ experience in Marketing and Communications across several industries including Print, PR, and Childcare. She is also passionate about events having founded two businesses in the past, one being an event styling business and the other being a women’s networking group.

Additionally, Alyssa is an accomplished writer and blogger, contributing regularly to mainstream press and media, including online publications like Mamamia.

Donelle Cowan

Talent Acquisition Specialist

Donelle has been in the recruitment industry for 5 years. Starting out as a candidate manager for temporary doctor recruitment, making sure paperwork and travel plans were organised with the doctors and hospitals. After 1 year, she stepped up into recruiting temporary General Practitioner doctors Australia-wide.

In April 2021 she joined Maven Dental Group recruiting Oral Health Therapists and Hygienists, after 6 months Dentists were added to her portfolio.


Meet our Impression Dental Group board

Our board supports the entire Impression Dental Group with an impressive level of expertise and dental thought leadership.

Dr. Michael Caristo


A/Prof Christopher Ho

Chief Dental Officer / Director

Mark O’Brien

Chief Executive Officer / Director

Tara Hariharan



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