Our Team

Our Directors

Sean Whelan

Managing Director CA

About Sean

Our mild-mannered, feet-on-the-ground guy, Sean is a car racing enthusiast with beautiful historic racing cars like his Brabham BT30. He doesn’t take risks on the racing track or with your financials.

Professional background Bachelor Accountancy -University of SA; Membership of Chartered Accountants Australia and New Zealand; RG146 Super and SMSF Specialist.

James Jarrett

Director CA

About James

James is the Director who always has golf clubs in the car boot and is often spotted having a hit on the beautiful greens of Kooyonga Golf Course. He’ll tell you he used to be a talented golfer, but we think his true talents lie in his financial and lateral business advice.

Professional background Economics Degree , University of Adelaide, Membership of Chartered Accountants Australia and New Zealand; RG146 Super and SMSF Specialist.

David Zweck

Director CA CTA

About David

A problem-solver at heart, David loves exploring the outback by 4WD with his family and sitting around a campfire with a nice glass of red. When he isn’t thinking about your financials, he’s probably planning his vegie patch rotation or next bike ride location.

Professional background Bachelor Accounting – University of SA, Membership of Chartered Accountants Australia and New Zealand;Certified Tax Advisor. RG146 Super and SMSF Specialist. Vice Chairperson of Immanuel College council.

Consultant – FCA

Neil Richardson


About Neil

Neil bleeds double blue! A passionate Sturt Football Club supporter and former board member, Neil is also a racing car enthusiast and gets especially fired up about his historic Formula Ford.
Not only does he bring a wealth of experience in accounting and finance to the team, Neil applies the same passion and determination to his clients’ business affairs, with a focus on successful outcomes and happy clients.

Professional background:

BA Accountancy, UniSA, Fellow of Chartered Accountants Australia and New Zealand, Member of the Tax Institute of Australia, Certified Financial planner, Licensed Auditor


Di Thompson

Operations Manager

About Di

When you meet Di, it’s easy to see why she is affectionately known as ‘Mum’ amongst her friends and colleagues. Bubbly and warm by nature, Di has achieved success in business during her career and now assists other entrepreneurs and business owners to pursue their business goals with her insightful wisdom and kind encouragement.

Di values precious time with her loving family, enjoys supporting kid entrepreneurs, loves learning new things and can be found relaxing with a good digital jigsaw.

Professional Background – Former Fellow of Australian Institute of Company Directors

Our Managers

Sophie McDonald

Senior Manager CA

About Sophie

Sophie is our not-so-secret golfing talent, with a handicap to rival the keenest of golfers. When she’s not on the course you’ll find her making her way through Harper Bazaar’s list of 99 books to read in your lifetime. An accountant with 15 years’ experience, Sophie is the beacon of shining light in the office leading our experienced team of accountants and planners.

Professional background Bachelor Commerce – University of Adelaide,  Membership of Chartered Accountants Australia and New Zealand; Currently studying Diploma Financial Planning.

Heath Bowden


About Heath

Family man Heath is a dedicated Dad who enjoys spending time with his two young daughters. Once possessing a keen interest in playing soccer and reading, Heath’s current spare time consists of pretend tea parties and receiving ‘pretty’ makeovers at the hands of his daughters.

Heath joins One Advisory with over 15 years’ experience working in smaller accounting practices where he has developed a personalised approach to assisting his clients.

Professional details: Bachelor of International Business and Member of Tax Institute of Australia

Tom Hyde

Manager CA

About Tom

Tom is the sports buff responsible for making sure the office kitchen TV is tuned into whichever sport is dominating right now. He’s the treasurer at St Peter’s Old Collegian’s Cricket Club who puts his finance savvy to good use on and off the field and is passionate about taking the stress out of running a business.

Professional background Bachelor Commerce (Accounting) Bachelor Finance – University of Adelaide, Membership of Chartered Accountants Australia and New Zealand;


Tabitha McFarlane


About Tabitha

Tap-dancing Tabitha runs a tight ship at home. When she’s not cooking up a storm to feed three teenage children or taking care of her three dogs, she enjoys strapping on her (tap) dancing shoes.

She joined the team in October 2016 bringing a wealth of knowledge and industry experience. Tabitha is passionate about assisting her clients, offering a personal and holistic approach to their accounting and tax.

Professional background

Bachelor of Arts, Chemistry – Oxford University.
Fellow of Institute of Chartered Accountants of England and Wales, and member of the Global Accounting Alliance.

Our Team

Katia Brumby

Senior Accountant - CA

About Katia

Katia joined us in 2013 with 5 years’ experience in professional roles. She has a passion for learning, reading and updating her knowledge and is a whiz on software that help our clients increase productivity with their financials. Her goal is to learn to speak a second language fluently. She coordinates all our staff functions and has loads of fun investigating new things.

Professional Background Bachelor Commerce (Accounting) – University of Adelaide; Membership of Chartered Accountants Australia and New Zealand; Certificate IV in Human Resources; currently studying Diploma Financial Planning.

Matt Medley

Senior Accountant - CA

About Matt

Matt is a purveyor of fine sporting teams including the Green Bay Packers, Newcastle United and North Melbourne FC, a playing member at Reade Park Lawn Tennis Club and a keen gardener and reader. He prides himself in ensuring clients are comfortable and strives to cut down complexity when it comes to the day to day running of small businesses.

Professional background –Bachelor Commerce (Accounting) – University of SA, Member Institute Chartered Accountants Australia and NZ.   Diploma of Financial Planning.

Joanna Zafiris

Senior Superannuation Coordinator - CA

About Joanna

Starting with the firm in 2009, Joanna has a reputation for quality work, friendly attitude and reliable.

Joanna is the foodie of the office and we’re happy to take any of her restaurant recommendations! Aside from food, she specialises in superannuation and is a Class Super Champion (if she does say so herself!)

Professional background – Bachelor Commerce (Accounting) – University of Adelaide,  Member Institute Chartered Accountants Australia and NZ. Diploma of Financial Planning.

Liana Fuda


About Liana

Liana joined us as a part-time undergraduate while she completed her degree and we’re thrilled she agreed to put up with us on a full-time basis after that. She’s honest, ambitious and committed to achieving the best for her clients.

Professional background Bachelor Commerce (Accounting & Corporate Finance) – University of Adelaide , Currently studying Chartered Accountants Program.


Jim Meaney


About Jim

Jim has a love of renovating his 1920’s cottage in Murray Bridge, and aspires to be the Grand Champion of Murray Bridge for best Produce exhibit. Loves spending time with his partner and aspiring artist Jane Mason and this means lots of galleries and exhibition openings.

He believes he is the most talented gardener at One Advisory and Matt is lining up behind him. Jim helps us in the Murray Lands and helps business start ups, and clients in the fishing and building industries.

Professional Background Registered tax agent, Member of the Tax Institute

Karyn Arnfield


About Karyn

A country girl at heart, Karyn loves the great outdoors and enjoys riding motor bikes and camping with her friends and family. When she’s not working around her rural property with partner Sean, you might find her relaxing at one of the beautiful McLaren Vale wineries on a Sunday afternoon.
Joining the team through the merger with Dover Madison,

Karyn is an experienced bookkeeper with many years in accounting and taxation under her belt. She takes pride in her work and has established long relationships with clients from a diverse range of industries, assisting them with their accounting systems and procedures.

Raine Li


About Raine

Raine joined the One Advisory team in December 2016 with 6 years’  experience in financial accounting and taxation for small businesses. With a passion in learning and updating knowledge she is dedicated to producing exceptional work and client focused services.

Raine likes travelling to explore various cultures and discover cuisine from different countries.  Every time she travels with her husband, she receives a local doll bear as a souvenir.

She is a food lover, loves experimenting with cooking in her spare time.


 Professional background: 

Master of Accounting &Finance – University of  Adelaide

Membership of Certified Practising  Accountants Australia

Manila Office

Mariz Chua


About Mariz

Mariz joined our office in Manila August 2015. She has over 4 years’ experience in General Accounting, Accounts Receivable and Payables management. She is experienced in Xero, MYOB and Quickbooks and loves solving problems.

Her passions are traveling and reading and the last book she read was Inferno by Dan Brown.

Professional background: Bachelor of Science in Accountancy -Polytechnic University of the Philippines. Certified Public Accountant license in the Philippines.

Althea Villa


About Althea

Althea joined the One Advisory team in Manila in August 2015. With almost 4 years’ experience in audit, financial accounting and self-managed super funds, Althea specialises in Class Super and is a Xero Certified Advisor. Since joining the team, Althea has a gained a solid understanding of various business and industries as well the reportorial requirements of various regulatory bodies.

When she’s not busy practising accounting, you can find Althea socialising with her friends, sharing a laugh or causing havoc on the soccer field. Crikey! The last book she read was the Australian Slang Dictionary.

Professional background:  Bachelor of Science in Accountancy – University of the Philippines. Certified Public Accountant license in the Philippines.



About Jemah

Movie buff Jemah loves a good plot twist. She spends her spare time watching movies and TV shows from a range of different genres and loves getting lost in a good book with a unique story line.

Joining the One Advisory team in Manila in December 2016, Jemah’s skills lie in general accounting, accounts payable and tax reporting. She is also working towards completing her Master’s degree.

Professional Background:
Bachelor of Science in Accountancy – Pamantasan ng Lungsod ng Maynila (University of the City of Manila). Certified Public Accountant license in the Philippines.


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