Dr. Tees is the Director of the Lymphoma Research Program and the Lymphoma Immune Effector Cell Therapy Program at the Colorado Blood Cancer Institute. His current research focuses on novel cellular and immune-based therapies in those with lymphomas and other lymphocytic disorders. He currently is a member of the American Society of Clinical Oncology and the American Society of Transplantation and Cellular Therapy. He is also a member of the American Society of Hematology and participates in the Communications and Quality Committees.  In addition, he is a leader with the Sarah Cannon Research Institute, serving on the Executive Committee for Lymphoma Research.

In his spare time, Dr. Tees advocates for patients by actively supporting the Leukemia and Lymphoma Society and LLS Colorado Advocacy. He enjoys skiing and hiking, and he never misses an opportunity to be outdoors. When traveling, he loves to SCUBA dive and visit exciting new places off the beaten path.