Dr. Abdul-Aziz Yakubu, Chair
Howard University
College of Arts and Sciences
Department of Mathematics
204 Academic Support Building B
Washington, DC 20059
(202) 806-6830

Ralph Twum

Address
Department of Mathematics
Howard University 
Washington DC 20059

Office
Room 229 Annex III
202-806-5654
e-mail: ratwum@gmail.com