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Mark A. Thomson, CPA

Managing Director

Phone: 312.670.7444

Fax: 312.670.8301

Email: mthomson@orba.com

“The most important part of my job is delivering the expertise that makes my client's comfortable and confident that they are in the right hands.”


Mark has been with Ostrow Reisin Berk & Abrams, Ltd. since 1980 and became a director in 1991. His career has been focused on providing financial and business advisory services for a variety of industries, including manufacturers, distributors and various service organizations. For these clients, he provides guidance on a full range of services, including audits, reviews and compilations, strategic management and income tax planning.

Mark has extensive experience with buy/sell situations and has helped clients plan for, and complete, their sales transactions. He also provides clients with consulting and planning services that maximize the goals of each organization. Mark has published articles on various manufacturing issues and led seminars covering several costing topics. He has been involved in litigation support and insurance loss engagements. He has also led the firm’s Employee Retirement Plan audit group.


Mark enables his clients to manage their businesses more effectively by helping them see both across the organization and into it. He can assist clients in reviewing product profitability, evaluating existing inventory issues and establishing more efficient buying guidelines and obtaining available funding from state and local organizations. He can also help review or set-up costing models by product and/or product lines, as well as develop proper systems of internal controls for their financial functions. In addition, he assists many clients with the implementation of their financial/accounting software packages.

As ORBA’s managing director, he oversees the firm’s vision, strategy, growth and overall performance. Mark is also focused on maintaining the firm’s strong team organizational structure that enables everyone to bring the best practices to each client engagement. He ensures the firm’s environment fosters collaboration, cooperation and development enhancing client value and building strong relationships.

Outside of the Office

Mark is exposed to growth outside of work too. His wife and three children enjoy taking adventure vacations that expose them to different cultures. Vacations are also built on following his children’s competitive sporting activities.

Seminars & Events

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