On November 8, 2021, the Board of Directors of ICF International, Inc. increased the size of the Company's Board from eight (8) to nine (9) members and announced the upcoming appointment of Dr. Michelle Williams to the Board. Effective December 1, 2021, Dr. Williamsshall be a Class II director, serving until the Company's annual meeting of stockholders in 2023, subject to her prior death, resignation or removal from office as provided by law. Dr. Williamshas been designated a member of the Audit Committee of the Board. Williams is an internationally recognized epidemiologist, an educator and a renowned academic leader. She has managed large-scale, multidisciplinary research teams involving the collection and analysis of epidemiological data and biological specimens and has published more than 500 peer-reviewed research papers on a wide range of studies from modifiable behavioral and environmental determinants of adverse health outcomes to genetic and genomic studies. Williams is also a member of several professional and scholarly associations, including the National Academy of Medicine, the Society for Epidemiologic Research and the American Epidemiological Society.