Dr. Hewitt is a member of the Clinical Laboratory Standards Institute Immunology & Ligand Assay Consensus Committee, and serves as co-chair of the Subcommittee on Immunohistochemical Assays and a consultant to the Hematology and Pathology Devices Panel, Center for Devices and Radiological Health, Food and Drug Administration. Dr Hewitt has co-authored more than 225 articles and servers on the editorial board of four peer-reviewed journals.