About Us

The Team Behind Horizon

Horizon Advisers is made up of a comprehensive team of certified public accountants and financial advisers with decades of combined experience helping businesses and individuals achieve their financial goals. Our reputation in the tax and wealth management industry is well known, making us one of the top choices for Michiganders seeking to invest in their future and enjoy the freedom that comes with sound financial decisions and management. We enjoy a high amount of referral clients, owing to the truly remarkable results we help our clients achieve in their financial lives.

Our firm was founded in 2012 with the primary goal of providing high level tax, accounting and independent wealth management services. Since its founding, our firm has attracted top level industry talent due to its reputation for integrity and a unique client-focused business model. Recognizing the crossover between tax services and financial planning, we decided to merge our efforts to provide our clients with the best possible financial results.

Our Team

Dennis Glasson

Principal | CPA

Dennis Glasson is a Certified Public Accountant and started his public accounting career in 2000. He has a Bachelor’s of Business Administration, major in Accounting, from Western Michigan University where he was a member of Beta Alpha Psi, an international honor organization for accounting students. Dennis uses his technical knowledge to provide full spectrum tax, accounting and business consulting services to his clients. He applies this expertise across a broad range of industries. Dennis’ mission is to be his client’s most trusted adviser and to consistently exceed their expectations.

Specific Experience

Tax services (Individuals, Partnerships, LLCs, Corporations, Trusts and Non-for-profit organizations) including preparations, analysis, planning and representation before taxing authorities. Extensive general business planning and consulting. Accounting experience includes: audit, review and compilation of financial statements, financial forecasts, cash flow analysis, projections and budgets, retirement plan consulting and bookkeeping.

Industry Involvement and Associations

  • Member of American Institute of Certified Public Accountants
  • Member of Michigan Association fo Certified Public Accountants
  • Quickbooks Pro Advisor

Mark Merski

Principal | CPA

Mark Merski is a tax accountant and self-employed business owner who has been working in the industry since 2005. Mark joined his father’s practice in 2007 after graduating with a finance degree from Michigan State University and a master’s degree in taxation from Walsh College. He went on to take over the business and expand it to what it is today. Mark grew up in Northville and attended Catholic Central High School. He bought a home in Northville three years ago and currently resides there.

His expertise is individual tax preparation and small business accounting. Mark delivers a unique style of tax preparation often not seen in the industry. The client sits down across from him at the table while the tax return is actually prepared. The client comes in with their paperwork and leaves with a finished product. This approach ensures a timely, efficient, cost-effective savings to both parties.

Mark recently merged with a partner and is going to be expanding his practice again. His father Terry Williams, who originally founded Wisley & Williams – the current firm Mark is managing, still works with him to this day. Mark has learned a level of personal service from working alongside his father and transitioning into running a tax practice with more than 500 individual tax clients.

Ian Manten


Graduated from undergrad with bachelor’s in accounting from the University of Miami FL 2007. Completed a Master’s of accounting in 2008 from Florida International University. In 2010 Ian became a licensed CPA in Florida. He practiced at a CPA firm for 9 years prior to joining Horizon Advisers in late 2019. He transferred his license to Michigan and has been practicing here ever since. He resides in West Bloomfield although originally, he is from Miami Florida. He enjoys culinary, sports, and spending time with his family.  He has become an essential asset of the firm. He has now been through 3 years of tax seasons and works with all the business clients throughout the year. Ian is 37 years old.  

David McGee


David McGee is a Certified Public Accountant and started his public accounting career in 2000. He has a Bachelors of Science with a Major in Accounting from the University of Detroit. David also has a Masters of Science with a Major in Taxation from Walsh College of Accountancy & Business Administration. He provides expertise in consulting services and is an asset to the firm.

David is an avid outdoorsman and enjoys following college and professional sports. He spends his leisure time playing basketball and tennis and bowling with friends as well as enjoying his home in Westland with his wife Connie.

Tax Services (Individuals, Partnerships, LLCs, Corporations, Trusts and Non-For Profit Organizations ) including preparations, analysis, planning and representation before taxing authorities. Extensive general business planning and consulting. Accounting services include: audit, review and compilation of financial statements, projections, retirement plan consulting and bookkeeping.

Steve Doot


Steve started his career in public accounting career in 2008, working for ten years at a small CPA firm in
Southfield. He graduated from Michigan State University in 2006, with a B.A. in Economics. Steve has
spent most of his life in Metro Detroit and graduated from Detroit Catholic Central High School in 2002.

Steve specializes in small business and individual accounting and tax services. Tax services (Individuals,
Partnerships, LLCs, Corporations) including preparations, analysis and planning. Accounting services
including reviews and compilations of financial statements, and bookkeeping.

Steve loves the game of golf and has held the title of Master Club Fitter at Dick’s Sporting Goods in Novi,
where he managed the golf department.

Maggie Bennett

Office Manager

Maggie started her career and love of office management while attending school in Wayne State University. Has over 11 years of diverse managing experience that has allowed her to provide excellent client experience and efficient office management. 

Personal Life:
In Maggie’s free time, she enjoys cooking up new recipes, raising her daughter and reading the next best Clive Barker novel. 

Megan Mcdonald


Megan McDonald is a Bookkeeper with Horizon Advisers. Megan began her career as an Elementary school teacher with a bachelor’s degree in Language Arts and Elementary Education from Madonna University. After several years in the classroom she transitioned into a role as Bookkeeper with a local masonry company, and went on to become QuickBooks certified. Megan enjoys time with her husband and dog, living in South Lyon.

Our Mission and Purpose

Our team is dedicated to providing the best quality financial planning and tax services possible, as we understand that ultimately our success depends on the financial success of our clients. We hold the firm belief that if an individual does not know where they are financially at the present moment, it will be impossible for them to know where they are headed in the future. Because of this, our practice schedules periodic review meetings in order to ensure our advisers are actively involved in our clients financial lives, giving them the correct advice to handle present situations and work together on continuing long term financial goals.

As a financial planning firm that individuals trust their financial lives and futures to, we are obligated to be in a fiduciary capacity with our clients. Because this is a massive responsibility, we have three fundamental principles that serve as a foundation for everything our firm does – Trust, Integrity and Respect.

Trust is vital for any business relationship, especially ones involving advisory services. Effective management of investments requires years of real world experience and knowledge, which is the foundation of our relationship with clients. We listen to our clients and deliver customized guidance for any economic situation, instead of simply offering a generic solution. This differentiates us from most other financial planning and tax firms that are unable or unwilling to provide personalized services.

Integrity is absolutely essential for any professional, especially those who work in the financial and tax industry. With so much riding on the line, it is imperative that the financial adviser you are working with has a strong moral character and strives to be fair, honest and transparent with clients, even if it is not in the firm’s best interest at that particular moment. We always strive to offer advice and guidance that is first and foremost in the clients best interest, as this builds trust and ultimately is the foundation for the long term success of all parties involved.

Respect is key to being able to understand client needs clearly and accurately, as well as ensuring the most productive use of resources when working together. We treat our clients as family, never imposing unfair or harsh judgement on an individual’s past financial mistakes or mishaps. Our clients’ success is our mission, and listening to their needs and goals for the future without judgement is the best way to gather the right information needed to give accurate guidance for their future.

Frequently Asked Questions

Horizon CPAs is a branch of the larger Horizon Advisers CPA firm, which was founded in 2012. Originally founded as Horizon Wealth Management, we merged with a local CPA firm in order to provide complete and comprehensive financial services to our clients.

There are six total employees working at our CPA branch. Dennis Glasson and Mark Merski head the office, with two CPAs working under them as well as two administrative staff.

Our results and client-focused approach are the biggest differences between Horizon and the competition. At Horizon, our success is dependent on our clients long term success, which is behind everything we do.

Our main office is located in Farmington Hills, on the northside of Eight Mile Rd just east of Gill Rd. We also have several other locations available by appointment in Plymouth, Troy and Wixom.

There are a wide range of CPA firms that an individual can choose from. Our clients choose Horizon when they are ready to work with a firm that delivers the best possible results for their situation with guidance and planning specifically tailored to their needs.

We offer a full host of accounting and tax services, ranging from business and corporate accounting management and auditing to tax preparation, management and advisory services. Whether it be personal or business, we have the capability to handle any accounting need.

All of our accountants are CPAs with many years of experience helping clients manage and settle their financial affairs.

Our accountants are based in our main Farmington Hills office, although they are available by appointment at our other offices in Plymouth, Troy and Wixom.