David Collins is an economist and accountant with over 30 years of experience in international health and development projects, including working as resident health care finance advisor to the Ministries of Health of Kenya and South Africa. He works for Management Sciences for Health in health care financing and is a professor at Boston University, where he teaches health care finance. He provides technical assistance and training to developing countries in all areas of health economics and finance. This includes the development and use of costing tools for modeling integrated packages of hospital, health centre and community services, as well as for modeling vertical program costs, such as for TB, family planning, malaria and community case management.