Patient Portal. menu. ... The very next year, Dr. Garber established an outpatient dialysis unit inside Moses Cone Memorial Hospital. After leaving the Army in 1976, Dr. David Olin joined Dr. Garber at Tannenbaum Medical Associates. In 1983, they both left Tannenbaum Medical Associates, and founded Garber & Olin, M.D., P.A., as well as another ....