Power of Attorney for Robert Smith

This filing details a Power of Attorney granted by Robert Smith, an officer or director of PARSONS CORP (PSN), to the company's Chief Legal Officer and Secretary, Michael R. Kolloway. The Power of Attorney authorizes Mr. Kolloway to execute and file Forms 3, 4, and 5, including amendments, with the SEC and other relevant authorities on behalf of Mr. Smith. This is necessary for compliance with Section 16(a) of the Securities Exchange Act of 1934. The document also specifies that this Power of Attorney supersedes any previous ones and remains in effect until Mr. Smith is no longer required to file such forms or until it is earlier revoked or superseded. Mr. Smith acknowledges that the attorneys-in-fact are not assuming his compliance responsibilities and agrees to indemnify them and the company against any liabilities arising from inaccurate information provided.