Grant Thornton Announces Arla Lach as New Leader for Chicago Headquarters

Chicago-based IPA top firm Grant Thornton (FY22 net revenue of $2.3 billion) announces a leadership change in its Chicago market. Arla Lach, an audit and assurance partner with nearly 25 years at Grant Thornton, will succeed Mark Sullivan, who is retiring after 14 years with the firm. Lach will officially assume the role of market MP on June 1.

David Platt, Grant Thornton’s central region MP, anticipates collaborating closely with Lach as the firm builds upon years of unprecedented growth. Platt commented, “Arla has been an essential contributor to Grant Thornton’s growth in Chicago, demonstrating her ability to cultivate and reinforce high-performance teams. I am confident she will serve as a catalyst for further growth in the years ahead.”

Nichole Jordan, the firm’s national MP of geography, added, “Arla is the right leader at the right time. Together, we look forward to fostering additional growth in the Chicago market and delivering distinctive experiences to clients across all sectors.”

Sullivan, Lach’s predecessor, said, “As part of my Chicagoland leadership team, Arla has epitomized what it means to be a professional services leader in our industry’s new era. Her ability to translate industry knowledge into effective strategies is invaluable. I have every confidence in her ability to lead the Chicago team forward.”

Lach expressed gratitude for Sullivan’s guidance. “Mark and our exceptional Chicago team have played a vital role in expanding Grant Thornton’s presence in Chicago and beyond, and we intend to continue this trajectory. I am eager to collaborate with our talented professionals to exceed our clients’ expectations in every aspect.” Lach brings a wealth of experience and a steadfast dedication to Grant Thornton’s continued growth and success.


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