Marc S. Williams, MD, FAAP, FACMG, FACMI is a clinical geneticist and informaticist. As of January 2012, he has been the director of the Geisinger Genomic Medicine Institute in Danville, Pennsylvania. He is the co-PI of the Geisinger Electronic Medical Records in Genomics (eMERGE) project and is the medical director of the whole genome sequencing clinical research project. He is site PI and leads the EHR integration workgroup of the NHGRI funded ClinGen project. He represents Geisinger on the NHGRI Genomic Medicine working group. He has participated in the Personalized Medicine Workgroup of the Department of Health and Human Services’ American Health Information Community Task Force, chaired the CDC’s EGAPP Stakeholder’s Group and was a member of the Secretary’s Advisory Committee for Genetics, Health and Society. He is a member of the EGAPP working group. He is a past member of the ACMG Board of Directors, and served as Vice-President for Clinical Genetics. He is past chair of the ACMG Committee on the Economics of Genetic Services and founded the ACMG Quality Improvement Special Interest Group. He is a member of the Scientific Advisory Board of the Clinical Pharmacogenetic Implementation Consortium (CPIC) and a member of the CPIC informatics committee and has participated in guideline creation and review for that group. He recently joined the Scientific Advisory Board of the NIH Undiagnosed Diseases Project. He is boarded in clinical informatics and is a member of the AMIA genomics and translational bioinformatics workgroup and was Geisinger’s representative to the Clinical Decision Support Consortium. He was elected a fellow of the American College of Medical Informatics in 2016. He has authored over 140 articles on a variety of topics including the economic evaluation and value of genetic services, implementation of genomic medicine and the use of informatics to facilitate genomic medicine.