About Mark A Wales Chartered Professional Accountants
Welcome!
Our firm offers a wide variety of services assisting a broad range of clients in the St Thomas and surrounding areas.
In addition to providing you with a profile of our firm and a list of services we provide, this Website will hopefully become a helpful resource tool for you.
As you browse our website you will find helpful newsletter publications (under the publications tab). You will also find external website links that we feel may be of interest to both our valued existing clients and future potential clients such as the Canada Revenue Agencey and Ontario Ministry of Labour sites.
Please feel free to contact us with any questions or comments you may have. We look forward to assisting you in all of your personal taxation and professional bookkeeping needs.
Thank you for visiting us !
Our Team

MARK A WALES, CPA, CA, LPA, - PARTNER
Mark A Wales is a Chartered Professional Accountant who has been in public practice since 2001 assisting businesses and individuals with their assurance, bookkeeping, tax and other operational needs.
Mark attended Wilfrid Laurier University obtaining his Honours in Bachelor of Business and Administration. He trained and articled in a regional firm in Norfolk County where he gained in-depth experience across multiple industries developing a broad set of skills to assist his clients.
In 2010, Mark became a sole-practitioner and purchased an existing practice in St Thomas. Growing once again in 2016 when he merged with the office of Ernest Manfredi. Mark now operates between St Thomas, London and Simcoe offices on a daily basis assisting clients with all their personal and business needs.
ERNEST MANFREDI, CPA, CMA
Ernie is a Chartered Professional Accountant who has been in public practice since 1974 providing income tax, bookkeeping and business management services to a wide range of clients. He held a variety of positions in industry and government before becoming a sole-practitioner in St. Thomas where he owned and operated his firm for over 42 years.
VICTORIA STEWART, CPA, CA
Victoria is a Chartered Professional Accountant who graduated from the Brock University Honours Accounting Co-operative program. She has been in public practice since 2004 and has a broad range of experience with small business, corporate, estates and personal taxation.
JENNIFER WHALLS, STAFF ACCOUNTANT
Jennifer holds the title of Staff Accountant with our firm, having almost thirty years of experience in the accounting field. She is a Business Marketing and Accounting graduate providing various services for our personal tax clients, estates, small business and corporate accounts.
CLARE POWERS, STAFF ACCOUNTANT
Clare has worked in public practice accounting for over twenty years. She has gained great experience in all aspects of personal tax returns, bookkeeping, payroll and corporate tax accounts.
ERIC SHERIDAN, STAFF ACCOUNTANT
Eric is a recent graduate of Western University where he earned his Honours Bachelor of Management of Organizational Studies. Eric is looking forward to developing his skills and knowledge and will be pursuing his CPA designation in the near future. He has many duties with our firm ranging from personal tax returns, bookkeeping and corporate taxation year ends.
TAMARA SLOTA, OFFICE ADMINISTRATOR / BOOKKEEPER
Tamara has worked in the accounting industry for almost thirty years. Her main role is office administrator overseeing all administrative functions in the office. She also has several other responsibilities including various bookkeeping functions for small business and corporate clients.
DENNIS REEVES, ADMINISTRATOR / BOOKKEEPER
Dennis has a two year accounting diploma from Fanshawe College. He has been a staff bookkeeper for over 8 years, with his duties consisting of several bookkeeping functions along with his many other administrative duties.
JESSICA (LI) TANG, ADMINISTRATOR / BOOKKEEPER
Jessica works out of our London location and is a valued asset to the office administration functions. She is working towards developing her skills in bookkeeping and tax preparation in order to best assist clients.