Gregory S. Flannigan

Greg Flannigan is a Tax Partner at Eisner Advisory Group LLC.  He leads the firm’s Private Equity – Portfolio Company Services practice and is a strategic leader of the firm’s Tax Mergers & Acquisitions team nationally. With over 25 years of experience in public accounting, Greg delivers strategic tax and advisory solutions tailored to the unique needs of privately owned businesses, private equity firms and private equity portfolio companies.

Greg partners with private equity sponsors, deal teams and portfolio company management teams to optimize tax positions and business operations throughout the investment lifecycle—from acquisition and integration to growth and exit. His expertise includes transaction advisory, tax-efficient entity structuring, establishing and implementing tax minimization strategies, equity compensation planning, and multi-jurisdictional tax matters.  His work goes beyond income tax—Greg focuses on identifying and executing operational efficiencies that drive EBITDA growth and enhance enterprise value. This includes streamlining finance processes, improving reporting systems, and aligning tax strategy with broader business objectives.

Greg serves clients across a wide range of industries, including manufacturing, distribution, SaaS, technology, and professional services. He has led numerous high-impact projects involving business restructuring, international expansion, and generational transitions. He is known for translating complex tax issues into actionable strategies that align with business goals and investor expectations.

Prior to joining Eisner Advisory Group, Greg was a Tax Partner at Lurie LLP and at a top national firm, where he advised clients on tax planning, business succession and transaction advisory across industry sectors.