Harrison LLP

Katherine M. Cunningham


T 239.494.5775
F 239.302.2348
Naples, FL

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Katherine M. Cunningham

Katherine Cunningham focuses her practice on advising high-net-worth individuals and families on estate planning and estate administration. She advises clients throughout the planning process, including the preparation of wills, revocable trusts, gift trusts, insurance trusts, and powers of attorney. Katherine works with clients, their families, and their advisors to develop a plan to transfer financial assets and manage their legacy.

Katherine has substantial experience assisting families through the probate process and has handled large and complicated estates with closely held business interests and international assets. She has supervised the preparation of gift and estate tax returns. She regularly works with family members, accountants, and investment advisors to transfer assets in an organized and thoughtful manner after death.

Her clients appreciate the personal attention they receive from Katherine. She connects her client’s hopes and fears for their beneficiaries with their objectives for their financial legacies. Hugs are Katherine’s favorite part of the practice.

In addition to being a member of the Collier County Women’s Bar Association and the Florida Association for Women Lawyers, Katherine founded the Southwest Florida group of Moms Demand Action for Gun Sense in America, and currently serves as the Legislative Lead.

Before joining Harrison LLP in 2017, Katherine founded a trust & estates practice with a small firm, Sonnenberg & Cunningham, Ltd., in Naples, Florida. Previously, she was a partner in the Wealth Management Group of Mayer Brown LLP and started her practice as an associate at Kirkland & Ellis LLP in Chicago, Illinois. She was recognized as a Rising Star by Illinois Super Lawyers in 2011.

“Tax Year In Review,” Trusts & Estates Magazine (Wealth Management, January 2007)

“Tax Year in Review,” Trusts & Estates Magazine (Wealth Management, 2006)

“Advantages to Back-Loading: An Analysis of Back-Loaded Annuity Payments from a CLAT or RPM Annuity Trust,” Tax Management Estates, Gifts and Trusts Journal (November 2004)

“The Service Upholds Power of Appointment as Method to Fully Utilize Estate Tax Exemption,” Trusts & Estates Newsletter of the Illinois State Bar Association (October 2004)

“Insurance in Estate Planning,” Chicago-Kent College of Law, Illinois Institute of Technology (March 2010)



Northwestern University School of Law, J.D., 1999

Williams College, B.A., cum laude, 1995

Collier County Women’s Bar Association

Florida Association for Women Lawyers

Moms Demand Action for Gun Sense in America, Legislative Lead in Southwest Florida

Illinois Super Lawyers Rising Stars, Estate Planning and Estate Administration (2011)

  • Prepared estate plan and gift trusts for family to utilize current, historically high gift tax exemption amount.
  • Structured residence trust to keep and manage home with special meaning for future generations.
  • Advised family office for estate planning and estate administration with closely held business interests.

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