Power of Attorney for David DeBrunner at Aon plc

David DeBrunner, Principal Accounting Officer of Aon plc, has granted a power of attorney to several individuals, including Colby Alexis, to act on his behalf in matters related to SEC filings. This includes the preparation, execution, and submission of Forms 3, 4, and 5, as well as obtaining necessary codes and passwords for electronic filings. The power of attorney is effective from August 19, 2025, and will remain in force until DeBrunner is no longer subject to Section 16 of the Securities Exchange Act of 1934 or until revoked in writing. The document also includes a notarized signature and seal.