Co-Founder, Chief Medical Officer, and President of Pecan Biotherapeutics. He was the CMO and President of the Vaccine Company, and Chairman, Medical Advisory Board Member and Consultant for Dacogen, NDA at SuperGen, Inc. He initiated and led the effort to pass and fund HB 3572 in the 2001 Texas legislature. HB 3572 established an unrelated cord bank in the State of Texas. From 1995 -1999 he developed a state wide consensus to bring a proposal to the legislature. In 2003-2004, Dr. Rosenfeld was Section Editor for Myelodysplastic Syndrome, Leukemia, Normal and Malignant Hemopoiesis, the official journal of the Leukemia Research Foundation, UK.