WASHINGTON, DC Today, President Barack Obama announced his intent to appoint the following individuals to key Administration posts: James OBrien Special Presidential Envoy for Hostage Affairs, Department of State Charles Chip Lyons United States Representative, Executive Board of the United Nations Childrens Fund (UNICEF) Aaron Williams United States Alternate Representative, Executive Board of the United Nations Childrens Fund (UNICEF) Esther Brimmer Member, National Security Education Board Michael Guest Member, National Security Education Board President Obama said, These fine public servants bring a depth of experience and tremendous dedication to their important roles.