John D. Halamka, MD, MS, is a professor of medicine at Harvard Medical School, Chief Information Officer of Beth Israel Deaconess Medical Center, Chairman of the New England Healthcare Exchange Network (NEHEN), Co-Chair of the national HIT Standards Committee, Co-Chair of the Massachusetts HIT Advisory Committee, and a practicing Emergency Physician. As CIO of Beth Israel Deaconess Medical Center, he is responsible for all clinical, financial, administrative, and academic information technology serving 3,000 doctors, 14,000 employees, and 2 million patients. As Chairman of NEHEN, John oversees clinical and administrative data exchange in Eastern Massachusetts. As Co-Chair of the HIT Standards Committee, he facilitates the process of electronic standards harmonization among stakeholders nationwide.  As Co-Chair of the Massachusetts HIT Advisory Committee, he engages the stakeholders of the Commonwealth to guide the development of a statewide health information exchange.