Mark "Coach" Mirsky joined KRD when his firm, ROI Business Services, LLC, merged with KRD in 2022. He specializes in partnership, S-corporation, and multi-state taxation, advising on start-ups, mergers and acquisitions, and international taxation. Mark works with clients in manufacturing, distribution, professional services, retail, healthcare, technology, virtual currency, real estate, construction, and more.

Previously, Mark worked in international tax at a global accounting firm and two middle-market firms in the Chicago suburbs, serving as a firm-wide expert on partnership, multi-state, and international taxation. He is an Illinois CPA with a master's in taxation from the University of Illinois, Urbana-Champaign, and is a member of AICPA and ILCPAS.

A recognized instructor, Mark teaches for TaxSpeaker, covering partnership, S corporation, C corporation, individual taxation, and tax law updates. He’s also taught for AICPA, Western CPE, and Vern Hoven Tax Seminars and has served as a panelist at the National Taxpayer Advocate Public Forum. In September 2024, he was named a Notable Leader in Accounting, Consulting & Law by Crain’s Chicago Business.

An active community leader, Mark was Chairman of the Bartlett Chamber of Commerce and helped develop Bartlett's Transit Oriented Development Plan. A soccer enthusiast, he’s attended four FIFA World Cups and one UEFA Euro Cup and currently coaches as an assistant for Bartlett High School’s varsity boys’ soccer team.  Previously Mark was the assistant women's soccer coach for Aurora University and also the assistant for Bartlett High School's varsity girls' soccer team.