 Some patients with Hodgkin disease or non-Hodgkin Lymphoma show evidence of infection with the virus that causes infectious mononucleosis Epstein Barr virus EBV before or at the time of their diagnosis of Lymphoma. EBV is often found in the cancer cells suggesting that it may play a role in causing Lymphoma. The cancer cells infected by EBV are very clever because they are able to hide from the bodys immune system and escape destruction. We want to see if we can grow special white blood cells, called T cells, that have been trained to kill EBV infected cells and give them back to subjects. 