Corporate Tax And Accounting Services

Corporate Tax And Accounting Services

We measure our success not by the number of clients we serve, but how well we serve our clients.

Our multi-generational advisors have the experience that our corporate clients can trust.

We add value by facilitating and assisting the owners, BOD, and management in monitoring performance, challenging the plan, progress, and process with the best interest of the owners in mind. With extensive Fortune 100 and Big 4 professional service firm experience, we are top tier advisors to C-Suite executives and businesses across the country.

Walker Ostrowski Williams has established long-term clients throughout the U.S., advising clients for over 35 years.

Our 2 specialists managing corporate accounts are
Mark Ostrowski, CPA, CFE & Partner
and Shannon Velasquez, CPA, MBA.


Mark A. Ostrowski, CPA, CFE & Partner

Interim CEO/CFO, Board of Directors, Multi-Generational Client Service and Succession Planning, Fraud Consulting

A founding partner of our firm, Mark was previously a partner at J.D. Gilbert & Company, having joined that firm January 2003.  Mark has extensive multi-generational family business experience from working in both private industry and public accounting.  He has developed several areas of expertise including forensic accounting; fraud prevention, detection, and investigation; expert witness; business and individual tax advocacy services; BOD advisory services; and interim CEO and CFO services.


Shannon Velasquez, CPA, MBA

Fortune 100/$35B Corporate Tax Director, Fortune 500/$4B Corporate Tax Director, Specialist in COVID relief stimulus packages for businesses.

Shannon’s extensive Fortune 100 and Big 4 tax experience poises her to be a top tier advisor to businesses and C-Suite executives not only in Florida but across the country. Shannon served as Corporate Tax Director at the world headquarters of a Fortune 100 Manufacturing and Retail company and Fortune 500 Retail and Restaurant company. Shannon is the in-house expert on COVID relief such as PPP loan applications and forgiveness and Employee Retention Credits.

Are you leaving government COVID money on the table?

Let us sharpen your financial awareness on what your business is entitled to during these unstable economic times.

Contact Walker Ostrowski Williams to learn more about our Corporate Accounting Services. We can also assist in your COVID-related questions.