Partners in Your Success

Our team is unusual in the accounting world because we actually work together for each client. At most firms, each accountant has his or her own clients; it’s a silo approach that denies the client access to the unique skills and specialized knowledge that others in the firm might be able to offer.

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That’s not us. We believe that you deserve the best service around, and if one member of our team is better qualified to advise you in a specific area, you should have full access to that person. We partner with you, as a team, to help you build a successful business and an enjoyable life.

Clayton E. Achen CPA, CA, TEP

Clayton E. Achen

Clayton is the visionary driving force behind Achen Henderson, the partner who looks into the future, sees what he wants to create, and brings everyone along on the adventure. His dream is twofold: to be at the forefront of the evolution of the accounting industry and enjoy his life while helping our clients enjoy building their businesses.

Clayton is the visionary driving force behind Achen Henderson.

Clayton is our Canadian tax expert and has a background is in tax compliance, planning, and strategy. He has worked with a wide variety of clients ranging from owner-managed small businesses to publicly traded oil and gas companies. He specializes in the taxation of private companies, transactions, and high-net-worth families.  

After a decade of retail management, Clayton obtained his Bachelor of Management from the University of Lethbridge in Alberta. He returned to Calgary where he articled for a mid-market multinational accounting firm then worked for several years in the tax group at another Big-4 accounting firm. Clayton is a Chartered Professional Accountant (CPA), qualifying as a Chartered Accountant (CA), and holds the Trust and Estate Practitioner (TEP) designation.

Clayton has completed Parts I and II of CPA Canada’s In-depth Tax course and advanced studies in owner-manager taxation, as well as the Canadian Petroleum Tax Society’s Taxation of Canadian Oil and Gas Companies courses. He is also a member of the Society of Trust and Estate Practitioners and a member of the Canadian Tax Foundation.

George Henderson CPA, CA

George Henderson

Nothing fazes George and his calm, logical, laid-back energy is the perfect counterpoint to Clayton’s drive and determination. Detail-oriented, he finds peace in the present moment, finding meaning in whatever task is in front of him.

George is focused on building lasting relationships and delivering excellent client service.

George is our accounting and controls expert with a background in accounting and financial reporting. He worked for many years in the private company groups of several large mid-market accounting firms and has also worked as a controller for a publicly traded oil and gas service company.

George completed his Bachelor of Management at the University of Lethbridge in Alberta. He then articled at a national accounting firm in Red Deer, Alberta, before returning to Calgary where he worked his way up the ranks of a multinational accounting firm in their private enterprise group. Most recently, George worked as a controller for a publicly traded oil and gas services company. He is a Chartered Professional Accountant (CPA), qualifying as a Chartered Accountant (CA).

George has extensive experience in financial reporting, financial statement preparation and taxation of private companies. He is focused on building lasting relationships and delivering excellent client service.

Carol Sadler CPA, CA, CPA (Illinois, U.S.), TEP

Carol Sadler

A people person, Carol relishes spending time with others, be it clients, colleagues, family, or friends. She values integrity and collaboration and enjoys meeting with clients to give them the information they need to build excellent businesses. A technical expert in U.S. and Canadian tax, she’s a valuable resource for U.S. clients doing business in Canada, Canadian clients doing business in the U.S., and individuals who have to file in both Canada and the U.S.

She values integrity and collaboration with clients to build excellent businesses.

Carol draws on an extensive background in Canadian, U.S., and cross-border tax compliance, planning, and strategy. She works with private companies and high-net-worth families in various industries, ranging from the oil and gas and resource sector to real estate and consulting.

Carol earned her Bachelor of Commerce with distinction from the University of Alberta. She then spent several years working in the tax group of a Big-4 accounting firm where she began to provide U.S. and Canadian tax services. Carol then established her own tax firm, Sadler Tax Advisors, which she developed into a respected Calgary area tax firm before joining Achen Henderson LLP as head of U.S. and cross-border taxation. She is a Chartered Professional Accountant (CPA), qualifying as a Chartered Accountant (CA), and a Certified Public Accountant (Illinois, U.S.). Carol also holds the Trust and Estate Practitioner (TEP) designation.

Carol has completed Parts I, II, and III of CPA Canada’s In-depth Tax course and advanced studies in wealth preservation. She is a member of the Society of Trust & Estate Practitioners, the Canadian Tax Foundation, and the American Institute of Certified Professional Accountants (Tax Section).

Andrew Sheer CPA, CA

Andrew Sheer

Passionate about continuous improvement, Andrew is a resourceful problem solver with an approachable personality and a very logical mind. He is constantly looking for opportunities for our clients to leverage their strengths so they can maximize value, reduce risk, and reduce costs.

Andrew draws on more than 13 years of experience and strong technical understanding.

Andrew is our clients’ first point of contact when they take advantage of our Unleashed service package. He draws on more than 13 years of experience and strong technical understanding of business systems to identify areas that can be improved to boost operations and efficiency and reduce stress for our clients.

Andrew received his Bachelor of Management degree from the University of Lethbridge, where he majored in accounting, in 2004. He is a Chartered Professional Accountant (CPA), qualifying as a Chartered Accountant (CA), and has completed levels I and II of CPA Canada’s In-depth Tax Course.

Andrew articled for a mid-market multinational accounting firm and a Big-4 firm before he was approached to join the Finance department of a Fortune 500 company. He joined Achen Henderson in 2018 because of his desire to bring enterprise-grade information integration and business intelligence analysis to small- and medium-sized businesses to help entrepreneurs achieve their goals.

Wallace O’Neil CPA, CA

Wallace O’Neil

The son of a high school math teacher, Wallace’s fascination with numbers and problem solving started at an early age and he continues to draw on it to help clients succeed. A manager at Achen Henderson, he’s involved with almost all our clients at some point, always communicating in a timely, professional manner and quickly getting them the answers they need.

Wallace values an individualized approach to serving clients.

Wallace’s background is in tax compliance and financial reporting. As a manager in the private company group at a national mid-market accounting firm, he worked closely with a variety of professional corporations and oil and gas service firms, as well as companies in financial services and real estate.

Wallace completed his Bachelor of Accounting at Mount Royal University in Calgary. He joined a national accounting firm where, as a manager in its private company group, he focused on assurance and tax for private companies and their owners, giving him extensive knowledge to help our entrepreneurial clients.

A Chartered Professional Accountant (CPA) who qualified as a Chartered Accountant (CA), Wallace appreciates Achen Henderson’s individualized approach to serving clients as he can focus on each client’s specific needs to identify the solutions that will help them achieve their goals. He is currently enrolled in CPA Canada’s In-depth Tax course Part II.

Liz McIntyre

Liz McIntyre
Liz takes the time to ensure clients’ needs are met and understood.

Liz’s motto is “How can I help you today?” and she applies it to all aspects of her life, including in her role as office manager at Achen Henderson. Liz has had an interesting and varied career, including owning a dinner theatre and working at a government registry as a clerk and co-manager. Throughout it all, she’s developed an incredible ability to provide support wherever it’s needed.

Liz ensures our office runs smoothly and efficiently. Friendly and caring, she takes the time to ensure clients’ needs are met and that any concerns are understood. She has experienced every type of business problem imaginable, giving her the ability to remain calm when there is “a blip in the system” so things are resolved easily and effectively.

In addition to working at Achen Henderson, Liz owns We Can Help U, which helps people with registry filings and other day-to-day matters that most of us need to take care of at some point in our life journey. 

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